I have a group of friends who had a roommate who like to start drama. Now she move to another apartment and is friends with my roommate. My roommate and I don't like each other. One night, My roommate and the girl where in my house just chilling. When I came in, they starting laughing and sounding like they are having a good time. The girl talk to me saying we are having so much fun and blah blah. My question is, should I tell my group of friends that her ex-roommate was here in my house being stupid, but I don't want to be a snitch and If I tell them how can I stop this non-sense.