A theme that is recurring in this thread is that when a woman has a "friend" that is a Nice Guy, and she's in a relationship with someone else, the Nice Guy will feel extreme hostility towards that guy. He might mask it at first, but eventually it'll be obvious. We all saw the guy who tried to frame his obsession's husband for cheating, but she didn't bite. I had a roommate who tried to plant evidence that his stalking victim's bf was cheating on her, but I saw what he was up to and told her. It was a fake dating profile, but she didn't believe it anyway since he barely knew anything about the guy and all his interests were wrong and the pictures were all from his Facebook. I couldn't kick him out because he had a lease, but I locked him out of the internet, and he didn't have a large amount of data on his phone, so stalking activities were limited. He got banned from the local library system (not just a single location, the whole system) for posting obviously shopped nudes of the dude online. When my lease was up, I moved into a smaller place with just myself, and from then on, I refused to take a roommate unless I already knew them.