boyfriend...

okay, so I love my boy friend of 1&1/2 years, and I really don't want to hurt him... but he doesn't make me happy anymore, like, emotionally or sexually... he has never gotten me to the big O, and well... he purposefully irritates me all the time. I don't want to hurt him but idk if I really want to be with him anymore.... I'm depressed because of all of this...ive all but given up entirely on sex and that stuff.... help me please, IDK what to do I don't want to throw away one and a half years, but I... I just don't know anymore.