Im in love with a girl,but shes leaving for a college/byu idaho and im going to a community , help?

im in love with my gf.. a year.. she is the right one, she says also.. the thing is...she is leavin for a school which im deathly afraid of that shes gonna find someone else.. she tells me i wanna be with u and such and its just so hard.. its like something could happena nd it really sucks =[ , what would be the positive way and all that, i just want to talk .