Ex-Bestfriend

Recently i got into it with my boyfriend and we broke up because there were some things about my past that i didn't fully tell him, my bestfriend was the one who told him. Though she apologized, i felt betrayed and felt like conversations she had with him was crossing the line. Most conversations would be that we shouldn't be together and it's not meant to be. I feel like that is okay from anyone else except her. But she feels like she owes him loyalty and honesty though the only reason they are friends is because of me.

My mother doesn't want me around her anymore and with that, my friend is now mad and feels like the things she's done was her helping but won't admit that she crossed lines. Should I feel bad and make up with her despite her inability to apologize or just leave it alone? We've really only been friends since last summer.