Here's one female's perspective on the topic:

First of all, the two of you are not married, she has the right to stop the relationship anytime she wants to as long as the two of you are not married. I do not support divorce so take your time, marry late, marry with some sense, do not get married if you are not 100% sure of your partner but for everybody's sake, do not get divorced.

You have the right to remain depressed.

Both of you have the right to remain friends if you two should choose to do so.

More important of all, ask your partner to make up her damn mind and accept whatever she choose.

Get on with your life dude, ain't worth flunking your semester. What were you thinking?