How do I break up with my gf?

She's been nothing but kind to me. Everytime I've let my gaurd down she's always supported me, but recently I've started to lose feelings for her. I hate myself for that and I've tried my best from the past few months to like her back but i simply can't... I don't wanna give her any false hopes and waste her time, can anyone help me out on how am I supposed to break up in such a way she doesn't get hurt much... Thanks...