I don't know if this can help you Jena, but I think I need to say it.
I learned many years ago, that jealousy was pointless. At the time I had a boyfriend who I was really committed to. But it was a problem relationship, the guy was passive-aggressive and manipulative. With hindsight, it is good I did not end up with him. But I fought for that relationship, and when there were problems I worked to try to resolve them. We were students at uni together, part of a larger group of friends, male and female mixed.
The time came when we formally broke up. He did not break it off finally; he said we needed to perhaps take some time apart for a little while, give the relationship a break. He left the door open for us to get back together and of course we would stay friends in the meantime, he said. Then almost within a week or two, he began to talk in our group about a lovely young Chinese girl who he sat next to in Chemistry. He hinted they had Chemistry in more ways than one! He kept talking about her, how he helped her with this, she helped him with that. I did my best to not react - I no longer had a claim on him. But I did wish he would shut up about her. Even the others in the group were, I think, getting a bit tired of him harping on about this girl.
Then one day we all filed in to lectures for another of our science subjects, and instead of him sitting with our gang, he was sitting in the row in front with a pretty Chinese girl next to him. All through the lecture their heads were close together. He would lean over and whisper, and vice versa. I realised she must be the girl he had been talking about. But I kept telling myself - I had no claim on him, if he ended up going out with her, that was no longer my business even though I was hoping he would get this wanderlust out of his system and come back to me.
As we filed out of that class, I met up with him at the end of the row of seats. "You haven't introduced me to your friend," I began. The look of triumph on his face was fleeting but unmistakeable - that unmentionable creep had been trying to make me jealous! he did not introduce me even then, just smiled maliciously and left.
So I sat and thought. There was no point my being angry with the girl - she did not know anything about me, probably had no idea of the baggage exBF was carrying. He had not introduced the girl to any of the gang - what did that mean about his commitment to her, really? Poor girl - she seemed a nice kid, deserved a lot better.
So I worked out how to get my revenge. I worked it out carefully.
I made friends with her.
In lectures when he and she were sitting together, I made a point of sitting on the other side of her. I don't know if it was a cultural thing for her or not, but she latched on to me as a female friend and began to ignore a glowering exBF sitting on her other side. And all the bignoting he had done with our friends, talking about how this girl couldn't do without him - what they observed for themselves told them how much he had lied.
What is more - I felt good. This girl was a really great kid, and certainly did not deserve to get stuck with my creep of an exBF. So instead of being consumed by jealousy and having that really horrible feeling in the pit of my stomach, I felt free and happy.
What I worked out was this - if me and boyfriend were meant to be, then it would happen. If he was resorting to trying to make me jealous, then he clearly still had feelings for me, but was expressing them in very unhealthy ways. If he was not going to be able to grow up and behave responsibly and communicate in an adult fashion, then the sooner I learned this, the better for me.
If the guy is mine, then I can be confident that any other woman making moves on him, or even having history with him, is not the woman in his life NOW. And if it turns out that there is a woman who means more to him than he realises, or than is good for our relationship - well then, our relationship is not what I thought it to be and the sooner this becomes obvious, the better for us all.
About a year after my 'game' with exBF, I was going out with husband when he was away with friends. While away, he met a cute girl who made moves on him. husband was trying to be faithful to me, his heart was with me, but here he was with a pretty girl snuggling up to him. He felt really bad when he found himself holding hands with this girl and berated himself for weakness. He told me all about it, expecting me to want to break up with him. I just hugged him because it was clear to me - his hand may have been holding this girl's, but his heart was with me. If the girl had been successful in seducing him away from me, she was welcome to him because it would mean he never had properly been mine.
husband didn't have a clue that this happened because he was being pursued. He was blaming himself. But I had my own suspicions.
Then husband met up with the group he'd been away with, and brought me over to introduce me to this female friend of his. As soon as she saw me, the look on her face confirmed my suspicions - she was NOT happy to see me, my presence was clear proof that all her efforts to win husband had been a waste of time. He never had been hers, never would be hers.
Knowing this with confidence helped me be gracious, polite and friendly. if anything, that probably riled her even more. Good.
Since these two incidents, I do not get jealous. If I ever have cause to be jealous, then my relationship is not what I thought it was, and if/when it becomes valueless there is no reason to be frantic about it.
Your husband was kissed by his exwife (now a lesbian in a relationship with another woman) when they were handing kids over. Frankly - this is the way friends and ex-lovers behave, acceptable. Some people are more tactile than others. When we go to church, I get kissed by the husbands of my friends. Their wives kiss my husband. At a friend's birthday party, he hugged me perhaps a bit longer than he needed to (I felt a bit uncomfortable) but husband was there, not upset.
I was introduced to a bloke of Greek descent - I barely know the guy. But I got two resounding kisses, one on each cheek! it is cultural, too. He was not in any way making a move on me.
I often see husband kissing some female. Even at a work function, at a work Christmas party for example, a female co-worker could come up and give him a kiss. I don't have a problem with that - I know I have his heart.
If I ever got upset with husband, it would be more likely to drive this sort of behaviour underground, or drive a wedge. My aim is to remove any wedges and work for openness and communication. While some people might see a demonstration of jealousy to be equivalent to an affirmation of love, I see it as insecurity and lack of faith in the relationship. If ever I feel so insecure, I re-evaluate the relationship and ask myself - do I really need this level of mental distress?
I admit I did have to work a bit to learn to shut off jealousy. But I feel so much freer as a result, so much happier and confident.
Look at the reality of your situation. Your husband is most unlikely to ever get back with his ex. Not only is he married to YOU, she is not even batting for the same team! She sounds like she was at times malicious and manipulative. He sounds like he is relieved to be no longer in a live-in relationship with her. BUT - they have kids in common, so they have to have a relationship together, of sorts. Unavoidable.
Do not make the mistake of channelling her, of demonstrating the same controlling behaviour that she was guilty of. It will be the first thing he will think of when you get upset - "oh, crikey, here we go again, another jealous, manipulative woman in my life! No wonder I have to tell lies!". You need to actively undermine those thoughts in him, so he will learn to actually come to you and volunteer the truth, rather than automatically lie because he's scared of how you will react. Make your relationship with him a haven from ex-wife stress rather than a second helping.
You are probably already working on some of these things. If so - consider this an affirmation.
Marg