My boyfriend (he's in his mid 60s) keeps cheating on me with his ex wife. He was married to her for 37 years and got divorced about 2 years ago. He sneaks off and goes to the casino with her. He claims they are not going on a date, but just carpooling together, even though the drive is an hour each way. Last night I also discovered he snuck off for a 3 day weekend with his ex wife (3rd time I've caught him doing this in 9 months) to go out of state to visit their adult sons. This last time, his one son spent the night at his girlfriend's apartment while my boyfriend and his ex were alone together the whole 3 nights. What do I do? I'm devastated.