I was posting as you were... His actions after the event IS what is making things so difficult for me. My normal reaction to his infidelity would be "you're gone!" And I can't speak for IC, but judging my his past moral actions and just who he is, I feel he would have the same feeling towards me if the roles were reversed.
But now here we are and things are not so clear cut for me anymore. 6 moths ago, without certainty, we would be in divorce preceedings by now if I had found out then. Now, with having seen how he has acted in trying to make our relationship good and with how good it was before he revealed...I'm probably 60/40 towards divorce. It's that 40% that says "things were good for you guys...is it possible to get back to that?"