Cheating on your spouse on vacation with the girls or guys is surprisingly pretty common if you look it up. The catch is women are more likely to do it.

In my opinion, your boyfriend should have been aware of this when he entered into a committed relationship especially with a woman who does exotic vacations with the girlfriends. No just with you, you are you, you can’t change, I mean women like this in general. Them’s the breaks. Maybe he suspected the possibility that it could or did happen but doesn’t want to know or be the insecure guy by digging or showing it, possibly leading to problem or in a worst case to the end of the relationship. He turns the other cheek, disregards it and life is back to normal.

Pretty common though. Look it up.