My girlfriends past?

I love my girlfriend to death but one thing is bothering me.
she’s a virgin and I’m not but she made out with her cousin and 4 other guys. the 4 other guys don’t hurt much but the cousin she did way too much when she was 15-16 and it was still going on till she met me and I told her how wrong she was.
she only did make out and nothing. I on the other hand did it many times with different partners

I literally called her slut many times and I am a shameless guy I know that. Can someone tell me how to get over this.
I don’t want to lose her
My girlfriends past?
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