Hi Nora. THis might be long!! I am 5 years the other side of my 'D'H's affair. Unlike your H, mine chose to leave, and I wasn't given the choices you have now. I'm not sure that was easier or harder, but it does make our situations different.
I still mourn the life I thought I had, and the one that, at this stage of my life, I thought I'd be having (we were married 28 years, together 32, planning retirement etc). It's really normal, I think, to feel bamboozled, and confused, and doubtful about what you now want. Personally, when I thought my H might go, I started some therapy to try and discover what I wanted, so even if he did decide to stay, did I want the marriage to continue, and how did I want it to change (because we were both unhappy)? I didn't get the chance to choose, but the therapy helped me come to terms, a bit, with what happened. I also got legal advice so I had some clue about finances, and my position post-divorce-my aim was to make it less frightening by knowing some facts, rather than relying on my fears.
I just really wanted to say, I know you, and anyone else in the situation, are scared about the future, and it feels right now as if wanting your marriage to continue is the best option. But if that doesn't happen, through your or someone else's choice, you WILL be ok. It won't be the same, for sure, and your life will be different. SOme of that difference will be good, some will be bad, and sometimes, good or bad, it's painful to compare the old and the new. But it will be ok, you will be ok. I wouldn't have chosen for my marriage to break up, but I can see now that if we were both to be happy, BOTH of us had to change. And my H was not a changing sort of person. I try to be careful to miss the reality of what I had, and not the dream of what I thought I had, if that makes sense.
Your original question was, is it possible to get over this. And I htink it is, but you have been betrayed in the most horrid way by both your H and by the OW and that will take time to assimilate. And to get over it, you BOTH have to want to, and your H has to accept that you might want lots of information, and you expect him to be truthful from now on. One of my underlying concerns was, how would I know he was truthful going forward? COuld I ever trust in the same way I had, knowing what I now know? Reading your posts, your H seems not to be contrite, or to have accepted his part in the trashing of your relationship and that, to me, would be an issue. But I am not here to tell you what you should or shouldn't do, just to suggest that you take time to work out what YOU want, what you expect from him from now on, and to say, you will be ok, you will learn to accommodate what's happened. I genuinely hope this helps.