If you take the high road while they consistently take the low road long enough, eventually you'll feel like a complete push over who lacks self-respect.

I personally have reached a breaking point in which I realize that if I don't do something different, then the people who've abused me will continue abusing me while all while I take the high road and try to be the better person.

I wouldn't call it revenge, because that sounds malicious. Let's call it tit-for-tat or "taking my ball and going home". If you repeatedly abuse me, you're out of my life. Call it revenge or call it whatever you want, but I'm simply not going to stand for it.