I say that to my friends I'm talking to when I've actually been thinking about them. It doesn't mean anything to me, though.
About that I don't know to be honest.
it's generally a good thing.
Can be just trying to woo you :/
Most of the time they are being sincere
I immediately shut down and go into dating-cull mode.<br />
ie: Constantly-stalked-serial-dater right here!