There is a girl that I like/liked but I know she doesn't like me, BUT I can't seem to get my mind off her and when I start to get my mind off her I see her at random places so I start thinking about her again. Also she is obsessed with this one guy. They keep breaking up then going out a few months later, now I know the guy and before I knew that they were going out I was fine with him, now I hate the site of him, or it just makes me angry. What do you all think I should do?