While I agree that you should move on and put it in the past. I will add that you have a scar. You can't heal it anymore and it is visible, but you have to move on and deal with it. If you can salvage the marriage I recommend that.

I believe in basing a relationship out of trust. That is a big deal... I think it is really hard to move on when you know you can't trust someone. The only way to know how to go forward, is to assess her as a person and the overall situation. We won't ever know this part to give you good advice.