I (18M) and my friend (18F) both work together and apprentice at our dance studio. We both help with different classes and some of them we work on together. One of the classes that we were working on together was on April fools so we both thought it would be funny if we swap shirts and she wore my hat(I always wear that hat at dance) and I put my hair up in little pigtails and we pretend to be each other. Disclaimer I am a 6 foot black 200 pound man. And my friend is a white 5’4” 130 pounds wet. The whole point was that it was ridiculous that we would even try to swap over because we were so obviously not similar. The kids loved it and had a blast the entire class laughing at us, and the teacher thought it was the most hilarious thing ever, and even tried to play along swapping our names. Well, after class, we took a picture to show our friends and to show my girlfriend (19f). She also works with kids, so I thought it would be a funny thing that we could share together after I sent the pictures to her. She didn’t respond for a while and then simply asked. “ why, did it work?” When she sent that, I immediately knew some thing was off from her usual happy response so I thought she just had had a bad day after a while. I asked her what was wrong. And she said she was trying not to overreact because she was mad at me for letting my friend swap shirts with me. (I feel like it’s worth pointing out that the friend I swapped with is bi and is in an amazing relationship with her girlfriend and has been for the past few years and I have known them both for almost 5 and never once has there been a romantic interest between us.) I drove over to my girlfriend’s house to talk to her about it because I could tell something was really wrong. When I got there, she was already in tears, saying she felt like I cheated on her and she feels like I basically kissed my friend and that she wants to break up with me. I love this girl with all of my heart. We have been together for a little over a year and it has been the most amazing year ever. Yes, there have been some hard times and some struggles that we’ve gone through, but I would do it all over again, with her. I was finally able to calm her down and explained to her that it honestly was just a prank and then me and her are fine and that me and my friend are nothing but friends. I even called my friend and she was hanging out with her girlfriend at the time and they were all able to talk and figure things out, but I still get the feeling that she is really upset with me. Her texts are a lot shorter and dull and it just feels like she is pushing me away ever since then.