I had to leave my cheating ex the day I found out. I'm insecure from the start, so, if you do something THAT horrible, my trust is completely gone and I'll no longer believe anything you say from that day forward.

Once a cheater, always a cheater usally deems true. So, stop making yourself insane trying to wonder and figure things out...if he can't make you feel secure after he messed it up, leave him alone.

Best Wishes!