Let's say it is MLC. You can leave at least a bit of your anger since it does seem to be almost an illness. You live your life, and the door is open a crack. Give him room, leave him alone, and see where he is in a year, or even two. It's not like you want to jump into another R right now anyway, right? If something comes up in the interim, well, you gave him the opportunity.
If it turns out that he shows no sign of coming back, you haven't lost anything, and you can spend the time healing yourself.
Here is a bit of opinion..... Even if his IS MLC, once he gets married it is going to be really, really hard for his ego to admit that he was wrong, and for him to come back. Even if he doesn't stay with her, it doesn't mean he comes back to you.
