Used for sex

Lila
Last December I had a started talking to this boy he was a year older than me and we went to the same school. Except he was at college at the time and I was in the last year of school. After about 3 weeks of talking we realised we had a lot in common such as music and movies and he did not sound like a fu*ck boy as some would call it. He seemed different. So after 3 weeks he came over mine however usually with first dates we would go watch a movie and go to a restraunt so I was quite surprised when he was insistent on coming over my house. So he came over and we watched a movie however half way through he started being suggestive so one thing left to another and we ended up having sex baring in mind this was my first time, however I'm not young a dum I'm sexually aware 😂. we stayed in contact for another 5 days then all of a sudden he started being distant and one word answers so I stopped. A couple of months later I discovered my friend who was more sexual was in a short term relationship with him in January and the same thing happend to her except she refused to let him forget about her she would text him paragraphs and go round and have sex with him whenever he wanted to.  I didn't have the courage to tell her about what he did to me. Im currently in a relationship now and I'm happy we have sex frequently which has made me forget about the past experience and be happier in myself however 2 days ago my friend said she was texting him and he was gonna take her  out in his car then she asked if her friend could come "me" and he said sure but once she  put photo of us on her snapchat story he said aw I'm not taking you out because me and your friend have past. I instantly felt sick and worried in case she finds out about what happens because that's my biggest regret. It's always been in the back of my head and makes me feel sick  Does anyone relate to my situation? Or does anyone have any advice on how to deal with the regret?