Panda has some really great advice for you! I would print that post and read it when you're feeling down.
As for snooping, I know you're not supposed to do it, but for me the knowledge has been power. I guess your heart needs to see enough to know the truth, but you don't need all the gory details. If you know he's having an affair and you know how far the affair has progressed, that's all you need to know. With my sitch, the lies continued until I uncovered the truth. Don't beat yourself up about snooping, just know that you may find something that will haunt you, which it sounds like you did!
Remember to act "as if" when you are with your H. Letting him know that you know about the OW won't help your cause. Act as if you were getting back with him soon and he just doesn't know it yet! Eventually he's going to get over himself and come to realize what an amazing woman you really are! God loves marriage and wants yours to be healed.
Pray, cry, take a walk, do whatever you need to do to put yourself in a better place before your date. Your strength and positive attitude will do more to affect him than letting him know that you snooped! You will do great! Let us know how it goes!
