Friend Advice

So about 2 years ago my lifelong best friend got with my boyfriend. My uncle had just died and when I needed her she was too busy getting it on with the man I was going to marry. she had done this to multiple people but I never thought she would do it to me. now its 2 years later I'm pregnant and I can tell she wants to be friends again. I've completely let go of what happened but I know I could never fully trust her again. apart of me wants my best friend back and wants to be how we were but the other part of me wants to not have anything to do with her. I'm so conflicted on what to do. she's been making herself present and trying to talk to me but I just blow it off. I kinda want my best friend back but I don't even know if I do. or even if its just my hormones from being pregnant. I just need some advice. and I already know how my family will react because they all hate her for what she did.