How can i save our friendship?

I had this best friend, who i met back in like the 4th grade. We were so close up until a couple of months ago. I mean we were like Eric Forman and Donna Penciotti (minus the relationship) but we had that kind of connection (although towards the end of high school she admitted she had a long-standing crush on me. Either way, she went to N.C. for college and i moved to florida and during the first semester or so we'd call each other every so often, i even took a roadtrip up there with some friends to see her and we met up one day when she was down here. But it's been about 3 months now since we last talked. She has a bf now and im afraid shes completly forgotten about me and left me behind but i cant help but feel that she thinks ive done the same. Why do i feel so weird just calling her up to say hi? Idk any suggestions?