My wife wants to have an affair

Hello everyone, I am living a painful situation at the moment. I have been with my girl for almost 4 years now. We lived the biggest passion / love there can ever be between two beings. She told me in the first days of our relationship that she had a problem of rapidly loosing interest in her partners but that with me things seemed different. I have to mention that are beginnings where chaotic, my ex was constantly harassing, my girl was with a guy... I made her suffer a lot, because I was kind of elsewhere in my mind at the time and she probably felt I was slipping through her fingers. About a year after, things started to change, her sexual interest for me was much lower. I guess it paralleled the moment where no more suffering came from me and that I found stability (with the ex etc..). Time has passed, we bought a house together, she is actually now pregnant. And 2 months ago, she told me she was speaking with her ex (the dude she dumped for me) and really wanted to see him etc... I was unhappy of course, but eventually accepted. Now she is telling me that she would like to have an affair with him, that it is only sexual and that she loves me more than anything... she actually told me that I too should have an affair... and even tries to find me potential women... I have to say my heart bleeds, as much as I love her, I am a faithful guy, and really could have gave her my fidelity forever (a thing I never even thought of before knowing her...) I can't stand this situation. She has always been a very honest person and told me everything. Although lately she has been hiding stuff. I checked on her emails and found out they kissed... and that she is planning to go to his house... It really killed me, she is 6 months pregnant for christ's f**kin sake. She would cheat on me with my child in her womb. I never felt anything as painful believe me.. I don't know what to do... should I dump her ? what about the child... I was so sure she was THE one. My world is upside down.

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