You know, I gotta ask some ?????
Like 1. Were you guys in a serious monogamous relationship and both parties knew it was supposed to be monogamous?
2. Were there ever any hints at his being a cheater? ie phone#s in pockets, callers that hang up?
3. And this one is a big one, Missing for hour or days and being vague about his whereabouts?
If the answer to these are yes, you have a player on your hands.
And contrary to popular idioms, you don't have to hate the player or the game, just refuse to play.
You can't lose if you don't play!