Yeah my group of friends in college had someone who joined our group a bit later, he was a roommate of one of the friends in the group who didn't really find his own group. I never really liked him. I thought he was a pretty crass asshole, but chalked it up to his shitty family life. He was smart, but to me he always seemed slightly devious, he is just the kinda guy who would try and test everyone's boundaries. I always included him and invited him over to hang with the group all the time, but there was something about him that always bugged me. And he would always ask weird shit like if he could borrow my car, or try and bum weed off me. At this point I realized his parents were not supporting him and he was struggling. So I went out of my way to drive him to costco so he could buy food in bulk, make sure he got in on the rotation and gave him some nugs to take home every now and then. I even started to think he had I side I could trust and I confided about relationship problems I was having with my gf and other things. So the kicker is he got me drunk and encouraged me to do more drugs and tell him more shit, then went behind my back and used that information to distance me and my gf... then they started fucking. So the group and I severed all ties with him, save one or two folks who were kinda assholes themselves. And went on with my life. I had a few good friends who helped keep me afloat in the time after that. Honestly the relationship was not set in good foundations and could have crumbled without his intervention, but I guess I'll never really know. Glad tho cause she is totally unstable and went and got knocked up by some other dude like a month after, so actually dodged a bullet. But I still want to gut that guy and watch him slowly bleed out. Just an awful person.