My girlfriend slept with someone else one month after we started talking. I didn't find out till months later after we were official?

Me and my girlfriend have been official since November of 2021. We started talking May 30th, 2021. I already knew her before because we used to be co workers and i have had her on social media for years but she always had a boyfriend so never really talked to her like that, I always had small crush on her.

About a month that passes by and at this point I probably hung out with her about 8-10 times. She invites me over to her new place for a little get together with friends to celebrate her new spot, everything seems normal but then another guy walks in the house and her mood sorta switches on the spot. At this point she dosen't pay much attention to me and just sorta haves me there looking stupid. I start to get jealous because this guy was making small comments to her that make it seem like he was trying to flirt with her. I start to get upset and I tell her im leaving. I was expecting her to ask me to stay over like she did the night before but she didn't. The whole night after I left i couldn't stop thinking that she's probably going to sleep with that guy but I just let it go.

Fast forward about 4 months and things are getting more serious. I decide to ask her about that night and she denies that she did anything it for a few days then one day she said "Okay, we just kissed but that was it" She started begging me so i giver her another chance. I don't believe her but i just let it go.

Another 2 moths or so pass by and we are now official. It is around November now and I ask her again, i make it seem like someone told me and I ask her again? She starts crying and she says YES. My heart literally sank. Ever since then we have fought dozens of times, we are still together but I just can't forget that night. That is the root of all the problems we now have, it has gotten mentally draining , We have gotten cops called on us because of how bad it gets when we argue. I know we weren't official but the way she did it just bothers me.
Leave her
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My girlfriend slept with someone else one month after we started talking. I didn't find out till months later after we were official?
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