I agree with PDT, because otherwise you might be sending the signal, I am a doormat, you can walk on me, cheat on me and I am okay with it. Of course your not, but she might be receiving that message. Don't be a doormat, firm but fair boundaries. You can save your relationship without allowing whatever she wants at least in your presence.
Married:10 years D final 8/28/08 10 minutes is all it took Life goes on and DB was no small part in growing from the Divorce!