It's nearly impossible to combat infidleity AND maintain her LIKING you QS.. The person that locks the liquor cabinet on the alcoholic is ALWAYS the bad guy who is "way too controlling" etc... It's a position you can't win...
You just have to say something like "Everything I am doing I am doing out of respect for you and our marriage.. I will NOT allow some creep to violate our marriage and I will do EVERYTHIGN I CAN to ensure we maintain civil respect for one another.. I DO NOT DESERVE to be disrespected in this way... we were married for TEN YEARS and even in divorce civilized RESPECT is IMPORTANT... I will NOT allow him to disrespect our ten years together"
The key thing is, you KNOW this guy's a dirt bag... what kind of creep presses someone in secret for sex like this when she's clearly angry with YOU and living with YOU?
If she WANTED to live else where she WOULD wouldn't she? Seriously...