trapt, it is hard to let go when it isn't fair. She may want to be best friends to salve her conscience or it may be that she just doesn't see anything wrong with it. During a visit to my physician yesterday, he said I was the safe place for my kids. The safe place is usually the most ignored, physically and emotionally. Others assume we will always be there. My doctor said that "it sucks to do what is right but it is worth it". With your wife, it can be even more challenging.
Hang in there.
Me:56, W:51 D:26,S:24,S:22 Married:18 Bomb 9/27/06 Separated 11/27/06 Divorced 10/6/08 Leaving it up to God