Dude, you already have the answer of your question! She start with a career and you don't, because you are still studying...
The most important thing so you can stay in healthy relationship is when the man makes the woman feel reliable. What I mean with this? - It is completely natural that the man is the one who is leading the woman. You can see this example in every spiritual or psychological book. The man by a definition is the head of the body and the woman is in fact the body! So if the body is act different from the head, then this two things will fall apart, logically.
My advice to you is: If she left you, then let her go and continue with your dreams and if one day she decide to comeback to you, then think twice before you do something... If you know what I mean.
So, you have to study hard now, for yourself, there will be a better girl.