You are only realizing he is evil now??? No contact, gray rock.
Realize that any one capable of the cheating, betrayal, lies and gaslighting has to be void of empathy. They are only nice when you have someting of value to them.
MLC, regret, foo issues are all excuses we like to project onto them because many of us here are not capable of that type of cruelty and its hard to understand that people are actually that empty, narcissistic, sociopathic, etc.
Best to not take it personally. You wouldn't expect kindness from an alligator right? Dont expect it frim them, unless it serves their needs. Yiu are dealing with extreme end of spectrum selfishness.