So, let me get this right. You have a problem of liking more than one girl at a time. And you want to get this girl you're obsessed about? Bro, come on, this ain't some game. Emotions hurt people. If you really think you will like other girls while being with this girl, then just leave her alone man. Save her the pain and suffering. If you love a girl. I mean truly love her. Nobody else in the god damn world should be able to change that. If you love this girl, there won't be a need to have feelings anywhere else. Maybe you should learn to love her, or atleast learn how to love because it seems to me you've never been in it.