Am i letting something bother me that shouldnt?

Me and my boyfriend of 4 years were having some problems and took a break for about a month. During that time i went on a trip to visit my sister. She told me i should try tinder to distract myself and that it would make me feel better. Anyways there was one guy that took a big interest in me and wanted to hangout and my sister was saying it was a good idea. So we ended up hanging our and doing everything except having vaginal and anal sex. Before then my boyfriend was the only person i had eber been with and i took pride in that. Now im back together with my boyfriend and regret everything that i did when we were seperated and cant stop thinking about it. I would really appreciate some other opinions about this