<human>: Give me the gist of the text in a nutshell

Just needed to vent this out somehow, to people i don't know

So ive never posted anything on reddit, but stick with me...about a month ago, my girlfriend of a year broke up with me for really no apparent reason. She continued to text me and she kept telling me she loved me and I didn't really know wtf her deal was..anyways, one week after us breaking up, she went to a party. The next morning, she told me that she wanted me to hear it from her first and she told me that she had kissed a guy a few times. The guy just happened to be the one person on this earth I despise, so I was pretty angry as you could imagine...fast forward to about 2 weeks ago, she starts begging me to take her back because her life is missing something without me..and after making her wait a few days I decided to agree to get back together. Now a few minutes ago I just found out from someone that my girlfriend actually gave the guy a bj and possibly had sex with him. I dont know what to do now, and I'm turning to reddit to see if anyone has advice or similar stories.
<bot>: my girlfriend dumped me, told me she kissed a guy, begged for me back, got back together, and now found out she might have actually fucked that guy.