I understand how you feel, but sometimes time is what gives you the answers. My difficult child has never actually apologized yet, but I don't think he's at that step in his program yet. I do know by his actions that he is sorry. The way he treats me and the way he tells me he loves me every single time he talks to me. The little comments that let me know he knows what he did to me. Mine never physically hurt me, but mentally he did a number on me.
Maybe the answer is time. This is all a proccess for both of you and you don't want him to say something that isn't coming from his heart. He may need more time to process and deal. I know you need it now, but you don't want it to be false.
