I have a limit and when you reach it I dismiss you from my life. It's that simple.And considering how I tend to forgive, even when I shouldn't, that limit is pretty high so if you're no longer a part of my life it's for a reason.
Never go back! And if what broke you tries reaching out to you again, ignore them. A valuable lesson for everyone to know. If they broke you to begin with then he didn't love to fight and be better for both of you.