hi hope4me, your love for your wife is amazing. it must take a lot for you to still protect her when she has failed to keep her vows. that said, you've been married 15 years. i want to scoff at some people here that aren't even married, and telling you to move on....its never so simple when you're married, is it?
i read a lot of threads here of men who have been cheated on. and the one common factor in all of them is that they all claim to be a super husband who' does housework, picks up wife, cooks, etc.' Although these are very sweet gestures, unfortunately, many women don't feel loved by these
alone. maybe in the past, but not in modern day context. a modern wife wants a husband who talks to her, shares his fears, laughs with her, shows adoration for her, listens to her.
for example: i think your wife tolerated your family for 15 years and maybe you should have listened to her concerns earlier on, and done something proactive about it. only now that she has interest in another man, do you pull out your guns and tell her you're willing to move.. she probably doesn't like that you only act under such dire circumstances.
that said, i think there's still hope4you. show her more affection.. ask her out on dates, etc. a woman just needs attention and love.
i hope she realizes how wrong she is to break her vows, and you guys come out of this stronger.
p/s: agree with the others who voted for marriage counseling!