Can it be "normal" again? No.

However, I am living proof that a marriage can survive adultery. In fact, our marriage is stronger now than it was before.

I guess, you first have to decide if you can ever get past the cheating. If you can't, then you are right to end it. If you can, then it's probably time to start getting your wife the help she needs while getting yourself help, too.

I've been in your shoes. It's a battle everyday, just like with any illness, but if you're willing to fight, then things can be good again. I wasn't willing to give up on the man I married. When I did have doubts about our marriage he wasn't willing to give up on me. I'm very lucky to have him.

PM if you need to talk.