I, unfortunately am guilty of surrounding myself with girlfriends who aren't necessarily "ugly"- but not like me. I wouldn't introduce my bf (now fiance) to any girls who looked better than me. I was so scared when I went off to college that he would meet some bombshell when he came to visit me on campus and would run off with her. It never happened and I got the guy, but I know too many people who had their significant other just find someone else and leave.
Now that I know I have him for good, I'm a total attention whore and flash the ring and
want other women to stare at him, so I can be like "Ha! Back off biatch, he's MINE!"