need some girl advice

so I was friends with this one girl, and 2 years ago when me and my ex broke up, she hooked up with him. that hurt me but I’m for giving people second chances so I remained her friend. dumb I know.

well the other day I had a gut feeling I needed to check my current boyfriends snapchat (different guy than other guy mentioned). (me and this guy broke up around may this year, and got back together in august.)

anyways, I checked his snapchat the other day and clicked on that girls name (we’ve all previously been friends) and scrolled up and read their messages. turns out he slept with her too in july when we broke up. so this girl has slept with two of my exs after breaking up.

I’m hurt neither of them told me, and that this girl continued being my friend without telling me. my boyfriend says he was drunk and had taken Adderall when it happened, so he didnt remember it even happening until i brought it up

i’m really hurt and confused right now and this girl is making me feel like i have no right to be so hurt. am i overreacting?

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