<human>: Can you summarize the given text in a few sentences?

Ok so this story starts off 3 years ago. Back then me and my girlfriend(we'll call her Katie) started to talk, we liked each other but I didn't know if it was mutual at the time. Other girls were talking to me at the time and one of these girls wanted to be in a relationship with me, I liked this girl too and we entered a relationship together. This relationship lasted for 8 months.

Due to this, Katie got upset and we stopped talking for 8 months. During this time we still talked here and there, wishing each other happy birthday etc. After I broke up with the other girl, I started to date girls, kissed girls, had one night stands etc

After a while, me and Katie started talking again. We became really close and we got into a relationship one year ago next month.  However we both have arguments regularly about my relationship past. Katie brings up that I left her for another girl, I kissed other girls, had sex with other girls and then after I done all that, I finally went with her. I was the guy who took Katie's virginity so I'm the only guy she's had sex with while I have had sex with 7 girls in the past. I keep telling her the past is the past, those girls don't matter to me and currently I am with her. We make up after these arguments but I feel like they are never solved, just swept under a rug.

I don't want to break up as we been together for one year and the relationship is great with everything else. So breaking up would be the last option.
<bot>: Girlfriend finds it hard to accept my relationship history and it's causing regular arguments. Don't want to break up, don't know what to do to fix this.