If you can learn to love yourself and all the flaws, you can love other people so much better and that makes you happy.
The energy spent trying to get revenge can be better spent creating an amazing life. Forget about them. Remember you.
"I don't know why we all hang on to something we know we're better off letting go of. It's like we're scared to lose what we don't even really have. Some of us say we'd rather have something than absolutely nothing, but the truth is, to have it halfway is harder than not having it at all." -Meredith Grey-
You deserved better. If he's being disloyal, replace him with someone who is mature enough to love you completely.