broke up, she moved on, now he's moving on to therapy bills

A Reddit relationship advice post from a 23-year-old male struggling with the revelation that his girlfriend slept with a coworker during their 3-week breakup. The post details his emotional conflict despite acknowledging the breakup was legitimate, and showcases contradictory advice from friends—one saying he's overreacting, another suggesting he end the relationship. Extracted text: r/Advice 2h ago RipCurrent1548 My [M23] gf [F22] slept with a coworker when we were broken up This has been an issue for a month now. We have been together for almost 2 years outside of a 3 week timespan we broke up because we kept arguing about the smallest things. We thought maybe we weren't giving each other enough space. I realized that I should not have broken up with her, it was a mistake once we had a little distance from each other. We got back together and found a good balance of spending time together. Things are going good again, but she mentioned while we were broken up she did sleep with a coworker. I am trying to get over this but I'm having a hard time. I've only ever slept with her. She's only ever slept with me until now. She apologized because she saw I was hurt but she said we were broken up which is true. They didn't even use protection, but she is on birth control. A mutual female friend of ours says I'm overreacting and the most important thing is our relationship has been really good lately. My guy friend said to break up with her.