ok so i had a huge group of best friends (10) wer all really close but hen within the ten we all hav our favortes. we all went on a school trip and i fell in love with one of the older boys who was on the rip, we all started hangin out with the older boy and his friends when we got home and everyone including him knew that i loved him and we had kind of a thing but nothing to get excited ovr, so then my best friend started dating him i was upset by this but i couldnt do anything because i had noclaim over him. they where in a relationhp for bou 2 years but then they broke up because they used to argue and stuff all the time. so theyv been broken up for a good few monhs now i think its abotu 5 or 6, but they still have sex every now and again he wants her back but she doesnt want anyting tdo with him. and so we where at his houe party and she went home and i stayed with my other friends and me and him gt flirty and stuff and we ended up having sex and i feel rally bad but iv always really liked him and stuff but id be devastated if she found out im not going to d anything like that again, but what should id should i tell her or not ?