LOL. well it seems like me and you are in the same boat. well, i feel the same thing. that nasty gut feeling when you think of it. in my case i cant get the girl i really like so, on nights like tonight (Saturday) i sit here thinking about what she is doing, causing me to feel like im going crazy.
I am willing to guess that you fall girls pretty fast and pretty hard. My suggestion would be to try to slow your feelings down to half speed. Don't let yourself get so invested and jealous until you really know you can trust her. Just slow everything down. It will protect you, and more than likely, your girl will find your calm, somewhat mysterious nature attractive.