If you really cared about her you'd be enthusiastic about the opportunity she has to better herself. Put yourself in her shoes man! She's enthusiastic about an exciting new life and you're all pissy and moany. She's going to take that to mean you don't want her to be happy, to better herself, or care about her ambitions. That's easily grounds for breaking up.
What if you did stop her from going away and her life turned to poo, how do you think she'd view you then?
