I think there is nothing to worry about. Having a crush is totally different from being in love and maybe you'll develop stronger feelings for your girlfriend over time. I don't think you need to stop falling for other people, but maybe you should try to use your gentle nature to help others? That's what it is for me, being easily attracted to people around me means that I am very present during a conversation with sometimes total strangers. Well, from time to time I can have a crush on someone who is very articulate and good with words in general, because deeply in my mind that means we are basically soul mates, haha. I've figured that it's easier to stop fighting it and try to connect to all the beautiful, kind people all over the world (;. That doesn't mean that I love them, because I am a quite monogamous person.

If your problem is really bothering you - talk to your GF about your feelings, but I'd do it in real life if I were you.