How do I break up?

There is a girl in my class, we started off as friends. Got close, and started dating this January. She comes off as a mean and rude girl but actually a very sensitive girl from inside. But we often get into fights because of some things I say. She says some mean things to me in exchange but we make up soon after. She has had a lot of relationships before this but this is my first one. I don't know what to do anymore. I tried helping her, and she says I'm the reason she's alive. But today she tried drowning herself because of a fight we had. Can someone suggest what I can do so I can break it off with her gently?

How do I break up?
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