Scared of breaking up with my girlfriend

So basically, me and my girlfriend have been going out for around three years, with a number of long breaks throughout. For a while I have been really happy, but for the past few months I'm beginning to have a lot of concerns. The main thing is that we argue a lot. At least twice a day, and it's really getting to me. It makes me just feel generally upset a lot of the time. Also, she seems to think it would be a good idea to go to the same city for university in September, and as I have already made my firm choice, this is a big problem. I think the arguing would only get worse in an environment where we are both going out to clubs with other people a lot. I just don't see a future with her, but she strongly believes we are perfect for each other and will be together forever. I would just finish it, to stop me feeling worse and to stop putting it off, but the problem is she always bangs on about how she wouldn't know what to do if I left her. In a previous break up with her, she went into depression, and was apparently close to hurting herself, with her friends making her go to counselling (bear in mind I only found this out after we got back together). So I'm just wondering if anybody could help me, as I really am at ends on what to do. Thanks a lot for any feedback!

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