Scared of breaking up with my girlfriend

So, basically, me and my girlfriend have been going out for around three years, with a couple of breaks over this time. I was really happy until a few months ago when we have started arguing constantly over everything, with at least two arguments a day. It's beginning to make me really unhappy, and to make things worse, she thinks it's a good idea to go to the same city for uni as me, and as I've already firmed mine, this is a problem. I just think that being in the Uni environment and going out all the time will cause even worse arguments. Now, I would go meet up with her and finish it, but the problem is that when we broke up before, she apparently suffered awful depression and even bordered on hurting herself. Her friends made her go to counselling. (btw I only find this out after we got back together) I just don't want to put her through that again, but she really believes we will be together forever, and as I aren't happy, or in love, any more I just don't know what to do. Any advice would be really appreciated, Cheers guys :)

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