What are the rules in being in a relationship and making new friends of the opposite sex? For me, if I do anything socially my girlfriend is there. Only time she doesn't go is when I go hang out with just 'the guys' and we just sit around, watch sports and drink too much. My girlfriend and I go out a lot with groups, some singles, some couples, and meet a lot of new people every weekend. So here is the scenario, what do you think about this? My ex was in dental school and I worked full time, did not live together. Friday and Saturday nights were when we hung out, either home or went out. During the summer months she decided just to be a waitress to try and save some extra money for school. She only worked on friday and saturday nights and got off around 2-230 AM. Usually she went straight home and went to sleep for the first month. We just planned on not seeing each other as much on those nights because she was always dead tired from school, her co-op, and long work shifts on the weekends. Then after about a month of summer after work one night she goes out with other employees to get a quick dinner at steak and shake (or some place like that). No big deal. But then the next weekend just her and a single guy after work did the same thing. Then the next night, saturday, they did the same thing. I just shrugged it off not wanting to be a jealous psycho. Then this continues, every friday and saturday night these two would go get a quick dinner after work, alone, for about 2 months. At this point I was really annoyed because I was not friends with him, had not been introduced, and knew she would never invite him to hang out with our other mutual friends when we all went out. So did I have the right to be annoyed? Did she have the right to say "he's just a friend"? So what are these hidden rules of making new friends of the opposite sex when in a very steady relationship? New relationships start a lot of time after being friends for a while. When are you allowed to be jealous? I'll tell what eventually happened after some responses.