What should I say to break up with my boyfriend without hurting him.
There's no way to not hurt him / her, but make sure you do it face-to-face, not through a call, text, email, or letter.
There's no way to break up with someone without hurting his/her feelings unless they just didn't care in the first place.
whatever you do, don't give him the "it's not you, it's me" routine. I, for one, HATE it when they say that.