I just found out my childhood best friend is dating the guy who made my life miserable in high school and I don’t know how to feel about it?

Long story short, I [20M] was best friends with this girl in Primary school and high school. I moved away and now I’ve found out she’s dating the guy who used to pick on me before I moved away. I’ve seen her a person a few times since I moved away and she’s never even mentioned him once but I know they’re dating because I’ve seen pics of them together on her Instagram. I’m not jealous (I’ve got zero interest in dating atm) but I still feel awful. It’s like, why would she date HIM of all people? The person who literally went out of his way at every possible moment to make my life a living hell? It just feels like a massive slap in the face
I just found out my childhood best friend is dating the guy who made my life miserable in high school and I don’t know how to feel about it?
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