Yeah...
I have had to cut my family out at times. For the most part I have let them back in. Although most recently I have decided to cut my dad out again because he's just too toxic. Everyone else in my family seems willing to put up with it and excuses his behavior, which baffles me but it's their prerogative.
I believe that relationships are relationships, no matter who people are. I think that if anyone in your life is treating you like scum and not giving you the time of day, breaking their promises, and leaving you hanging like they did to you, let 'em go. They don't deserve you. And I just want to say I'm really sorry you had to go through that. I can't even imagine how distressing that must have been for you. I'm glad you were able to get through it though, and find a place to live.