Okay I'm just gonna try to sum it up here. I dated my ex bf for about a month. But we always stayed in touch even after broke up. We still love each other but he doesn't want to do long distance right now. Anyways I was dm in this guy and we meet up and I told him we wasn't  gonna have sex. Well we pull up to this park and he started kissing on me. I kept telling him we ain't gonna have sex. So his like trying to have foreplay stuff and I keep moving his hands. He eventually pushed his hand down my pants. Then he pulls my pants down saying, "I'm just gonna lay my d*** on it". Odd of sudden he pushed it in. So it started to happen... he takes me home and says text him. I go in the house and get on his Instagram and I discover he follows my ex. I freak out because I don't think it's right if I hook up with my exs friends. I started crying and called my exs twin because we're best friends. To only find out that the guy is their cousin. I proceeded to cry even more. He's telling me to calm down, I didn't know. I text the guy and tell him that definitely wouldn't happened if I knew y'all was related. My best friend told me he wouldn't tell his brother. But I feel so bad about it! I feel like used.. Anyways My question is should I tell him?? If so how do I tell him??