Comment moi (25M) devrais-je rompre avec ma copine (25F) ?

basically there's a girl that i liked during this summer i met her 2 months ago and we made out after one week but the next day she went to oxford for 2 weeks so i wanted to wait her but one of her friend told me she made out with another guy she met at oxford. that made me sad so i went to a party to do the exact same thing she did but there was a problem, the girl i kissed was her best friend. i was extremely drunk during the night i did this but there were no excuses and i told her what i did, she was pretty upset but she forgave because she did the exact same thing. now it's been 2 weeks i haven't see her but we keep text messaging and i told her that i really like her but she was pretty sceptical because she told me that it was always the same and that she was never the only one in the mind of guys she made out with. i told her that she was the only one in my mind and she told me that for once she would trust me. so she told me she loves me and she's always sending me reels about couple and saying «us» but now i'm wondering something what if she doesn't like me at all what if the thing she likes in me is the attention i give her and the way i make her feel special. but i can't really tell her that cause i know she's gonna be mad at me and tell everyone i'm a dawg. so i thought abt it and i talked of that to a friend of mine who is also one of her friends, he told me that i'm probably right and that i need to talk to her but i don't want to because it can't finish in a good way. i also think that because of that our relationship wouldn't last for too long so that's another reason to quit her. and now i'm here asking for some advice to break up with her without hurting her and without hurting my reputation. thanks for your time, ill reply to every messages.