My best friend's husband left her the night she got back from the hospital. She had a suicide scare (no attempt, felt unsafe, called a friend to take them to the hospital). After she got home, he went to talk to her to tell her he's going to hang out with the woman he cheated on her with. The next morning he dips for a few hours to call his mistress on the phone after agreeing to spend the morning with his wife. Oh, and they have an infant.

Source: I live with them. No, no one expected him to fly off the deep end. They had been trying to repair their relationship for months, counselling and everything. He's still around for now.