My wife once asked me a few years ago if I would contest a divorce. I told her I don't want to talk about it right now and went on with my business. Still married - and I love my wife! 
Hmmm...can you be sure she hasn't fucked another man?
Sounds like you didn't want to address such a blatant statement.
Some men do this & just ignore the signs, seen it happen to guys.
Maybe deep down you need her more than she needs you