How can you say that you don't love her aymore?

ha ha, don't say like that, because its a relationship...

Why do you want to break up? Is there someone new in your life? Is the relationship lacking something? If so, remember the grass isn't always greener on the other side.. Not to mention, why would you want to bail out of a ship that, although it may be slowly sinking, can be repaired and sailing open seas again? (with a little work) Other than that, if you just simply want out, be honest and sincere. Don't let it become an argument, and don't point fingers. Just tell her your reasoning, and tell her it's just how it has to be. (Now that doesn't mean, "Look, the Holidays were a little generous to your hips and thighs, and I'm on a diet,... So I gotta Jet." ) I'd say, first, try and fix the situation, and talk to her about it before you give up.

Oh man it's really not a easy thing to do. We just try the best to hurt her as less as possible. Maybe you could say 'Hey, you're very nice and I'm very happy to be with you, but after these days, I think maybe it's best for us to be just friends.' It's always be a good excuse.