AIO? I broke up with my bf after I found a vid of him giving a girl a shoulder ride at a rave

We ( I am 21F and he is 20M)have only been dating for about two and half months. I’ve never had any issues in trusting him until this today. He doesn’t follow many girls and I noticed a new girl in his following. I check her highlights and I found that video. It was four days ago. I knew he was at a rave that day he told me. According to him I should trust him- Was this an overreaction,, I don’t think I can trust him anymore,, any thoughts and advice is great