What should I do?

i broke up with my ex about 3 months ago. recently he and his friends have been talking about me because after we broke up, i agreed to one of his friends that I would give him a *******. however, his friend was just messing with me, but i took it serious. now they kinda just look at me dirty which really annoys me. things have calmed down a little, but im still really confused on how i should act and feel about this. I havent talked to my ex since we broke up, and he probably doesnt want to talk to me anymore even if we get to after what just happened. i am honestly not a slut though. i dont look like one and i dont act like one. my ex was the only guy that i have every given a ******* to.i just mistrusted a "friend". Ive been kinda ignoring them but this whole thing still bugs me. What should I do? and how should i act to this? im 15 btw. Thanks in advance