Need to break up with my girlfriend.

I know that I need to break up with my girlfriend but I'm having trouble doing it.

I'm having trouble because I love her. We are in love with each other but we are seriously not compatible at all. If I tried to list all of our issues this post would end up being a 30 page essay. These issues aren't just minor issues either they are serious.

I'm also hesitant because this is actually the second time we've dated, the first time was for about 2 and a half months, then I broke it off, and I'm also the one who asked her out again which makes me feel like an asshole every time I think about ending it.

I broke it off the first time because I realized I was starting to fall in love with her and realizing we wanted very different things out of life, I ended it. We got back together because my feelings for her grew plus I talked to her and she agreed to make some concessions on certain things. She agreed to have three children and be willing to move out of state.

Since we got back together we've been dating now for more than a year and it has not gone well, and it has become apparent that she never had any intention whatsoever of actually keeping her word on the concessions. She has shown very apparently that she never wants kids, and she has actually admitted to me that if we move more than an hour away from her home town she will resent me for the rest of her life(she lives in one of the poorest shit holes in the entire state, and if I live anywhere near there I will have few opportunities and no good opportunities of using the degree I'm putting myself $20,000 in debt per year to get). There are also other promises she's made that she has since admitted she doesn't intend to keep,(the irony of course being that the mere thought of me saying any lie be it small or large, real or hypothetical, has made her so angry that once when describing a completely unrealistic hypothetical in which i would lie to save myself from going to prison while I was driving, she actually had me stop the car on the road so she could get out and leave.)

Well I didn't mean for this to turn into a rant but it seems that it did, anyways I'm not sure how to go about it. As I said we do love each other and I know she's wanting a ring but I CAN NOT marry her.

So the question is, can any of you tell me how you think I should handle it?