You are also in high school, so I’d say you were also a victim in some ways. I am in no ways trying to demean you, but generally people aren’t done growing up mentally or emotionally until their late twenties, if even that. Regardless of how things went down, you probably weren’t mature enough to be of fully sound judgement on what you did. I cringe now at some of the things I did in high school and college when I thought I was such an adult. Yes you messed up and learned consequences, but the bigger villain here is the ex - even if you had come onto him, he should’ve been the one to walk away. Also in your telling it sounds like you slept with the XF because you thought they had broken up, when they hadn’t. If this is the case he also lied to you in a big way.

I’m glad you have the chance to mend your relationship with your aunt. And I’m glad you told her and she is rid of that piece of trash. Hopefully the rest of the family will calm down about things too soon.