So my boyfriend and I have this mutual friend who is known for being kind of a man whore for lack of a better term. He has a reputation for hooking with his friends girlfriends which I cannot say is ok at all! He is kind of an asshole in that respect.. But he is honestly really sexy. I know it's wrong of me to say but I am very attracted to him. So late last weekend I was hanging out with a group friends and he just happened to be around and he kept giving me these looks and biting his lip, and it was really getting to me so at some point I just pulled him aside and asked what was up and he tells me I look sexy today and that he is just admiring me. I told him to cut the crap because I can't have my boyfriend's friends gawking at me. It's weird. He insisted that he was just playing around and that he just likes me as a friend the way he likes my boyfriend. I was stupid enough to leave it at that and we just rejoined the group. Fast forward about an hour or so and we are walking home (we dorm on campus at the same school) and he starts reaching for my hand and I for some reason let him and hold his hand.. Well as we are walking up past the campus entrance my boyfriend just so happens to drive by on the way to work and sees and starts texting me all this awful ridiculous stuff about how I look like a whore and a bitch and it honestly really hurt because I had done nothing wrong. He ends up bringing up a bad memory from my past and I almost cry and breakdown and I am so angry with him. Long story short out of anger and frustration me and his friend go to my room and we start talking about his reputation. He actually admitted that he has made some poor choices and that he feels awful. He then also says he really cares about me and has been thinking about me a lot lately. I kiss him and tell him he's sweet and he like gets on top of me and we start making out and running our hands all over each other and we just got progressively more naked till I was in my underwear sucking his dick in my and boyfriend's bed and honestly, I loved it. He is attractive, sweet, well hung, knows hot to satisfy, and he is soft spoken. So thinking all this I ask him if he wanted to have sex, so we do. He fucked me better than any guy I have been with and I can't help but think that it's wrong especially in our bed.. But I didn't stop. I just let him have me and then he went home like it never happened. Am I a slut?? Is what I did horrible?? Because I know I should feel horrible, but I do not. And I know that me and him are probably going to do this again and again. Should I just dump my boyfriend,?? Or should I tell him what happened??