I've struggled with this too. In my mind there is no other legit reason other than Adultery to divorce. Religious and all. I still consider myself married. I reacted to this by moving my ring to the other hand. If she does finally does admit that she has slept with someone, it comes off for me. She has broken the trust that the ring symbolizes. She has broken our covenant. I don’t believe in divorce, but its not up to me. I think this is a very deep personal choice. Your choice.

Maybe this helps?