Am I a bad person for doing this

I hooked up with my exs best friend.

A little back story, so I hung out with my (ex’s) friends before I met my ex and started dating him (I meant my ex through his friends). So after everyone in that group broke up with their SOs, my ex’s Best friend started hitting me up and one thing led to another. I feel bad for what I did and I feel like it makes me a terrible person.

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