Move on?!!? come on Patrick
I think you got a chance it doesn't mean you should now think and try to game only her...
But it does mean that I think you should try to do something about it.
If she goes for the summer so you can't really do anything at this time...
But you can talk to her over the phone and please for your own sake don't bring what happened 1.5 years ago up and apologize it won't do you any good.
Just say something like "Hi how are you doing? we have not talked for a while... just calling to say hi" and try to understand when she will go and when she will come back and if you can meet her you can say "you know what? there's this movie bla blabla would you like to come with me?" or something like "you know... we should get together sometime I wonder if you're more cute than you used to be

(smile while you say that cuz people can hear your smile over the phone)"
Hope I helped.