She has to get her divorce.

Then she goes to counselling, rehab what have you. Plus she should do things to take care of herself. If she comes back home, she falls into wife role and you forgive her, love her the best you can.

You may as well tell her, that she may as well do all the crap in the world she wants to do before you take her back, because your not going to be with a wife whose going to cheat on you.