I'll keep this as short as I can. Me and my wife live in separate states currently due to my being in the military and there being reasons she can't move. She has a facebook friend that she has known for 4-5 years but never hung out with in person. He's a good looking guy etc and she used to have a crush and wanted to date him. He also (just his sense of humor) used to leave comments on her facebook with a sexual tone at times until I said something and me and my wife got in a fight about it.
Anyway I noticed on our phone bill that lately they have been texting each other more and more late at night only typically. I know if I approach it will start a big fight, I know they haven't hung out or anything but it's really starting to piss me off and I feel totally disrespected because she knows if I had my way he would be out of her life and she doesn't like when girls in her guy friends lives from growing up tell them to stop talking to her. I just don't know how to approach it, suggestions? If it turns into a huge fight this could end up with me telling her he goes or I go.