ok so my bf dumped me the other day so i was like im not having that! so i went round to his looking gooooooooooood! anyway he wasnt in so i just hanged with his friends, well one of them really likes me and we were in the kitchen talking, i sat on the side (like on the top and the side bit) and i was like oh give me a hug yeah so we did but then i wraped my legs round him and kissed him....ok so we ended up having sex, this guy lives with my ex and cos this guy likes me now i think he thinks were together, and im not sure i wanna be with him.
should i tell my ex? cos i dont want the other guy to have like a fight with my ex and then just blurt it out or something.