Breaking up?

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Me and this girl have been dating for a couple months now, and I'm not internested in her, and I am wanting to break up but then again I don't want to put more pressure on her by doing this. We have already broken several times then I keep crawling back and now it is getting to the point that I can't keep doing this because of what it is doing to me. I want to be happy, but at the same time, I want her to be happy too but I don't know how to do both. So my point is, should I stay with her and try to be as happy as I can be, or should I just face what will happen and break up with her should that I can be happy? I really need help on this one