<human>: So my girlfriend and I started dating 2 and a half years ago. We both were crazy for each other, but her racist mother (I'm Indian btw) wouldn't allow it. But there came a point where we just said screw it let's date without her knowing. 

So we date. Both of us have never done anything sexually with anyone else before. So we were each others first. We didn't have sex, but we did basically everything kids do. Ya know making out cuddling oral and all that jazz.

Her mother just happens to also be crazy however. She monitors her phone shows up where ever she is and just is always in her business, so it was hard for us to date in the first place. After I graduated high school (two years older than her, she's a senior now) it got even harder. We weren't allowed to see each other. And communication is difficult with her mom monitoring everything. We found a way to communicate now, but it was hard at one point. We even started writing each other to keep contact. 

But there got a point where it was too hard for her. All the stress from keeping me a secret and seeing each other secretly and it hurt her a lot because she'd miss me and couldn't see me. She wanted to break up because she was hurting. 

After she broke up with me, she got with some other guy to get over me. She gave him a handjob. He performed oral sex on her. I was her first for everything and she was my first, and still is my only. I've only loved her. 
Today, we're together and love each other very much. But what she did with that guy keeps messing with me. I'm going insane. What do I do about that? She's a total good girl and were both each other's first. This is the girl I wanna marry. But I can't get over what she did with that guy.

Can you summarize the given text in a few sentences?
<bot>: current girlfriend messed with guy during break in our relationship. We've only been with each other besides that incident. How do I get over what she did?