My friends. in My Friends.

I have had these friends from freshman year. This year I have found out over time how truly toxic they are to me. Coming over uninvited, making rude comments to not just me but a little sibling. Basically I have felt used over this time and it is exhausting. One of my friends has had an issue with me and it is because sophmore year I was flirting with her boyfriend when I was talking to another person, and I did something with her crush that she knew had a crush on me and apparently these are her reasons for wanting to end this friendship. Which to me sounds rude and that they are just holding a grudge for years for no reason, it feels like she has an issue with me and like I cant change the past and I cant redo it. I dont understand why she had such a hard time telling me these things either.