We have all told you for quite awhile now what you need to do. Still, you don't do it, and you then ask "What should I do?"
You say you have set boundaries. Can you give us an example of what boundaries you have set? If you say "I told her I won't accept ________ ," but your actions don't enforce that, then that is not a boundary. WORDS are not boundaries; boundaries are specific things that you communicate that you will NOT tolerate, and that WILL have consequences if violated.
From where I'm sitting, the only "consequences" your wife has gotten so far for cheating on you, is that you take her out and are nice to her. That's a pretty nice arrangement; why would you be surprised that she's not giving it up?
