Feel guilty about promises you made in the relationship

In my 10 month relationship my boyfriend and I made alot of promises, I know It's gonna hurt him really bad if we broke up . But my feelings have changed for him and that spark we had has faded and I don't know what to do. I want to end it but I'm afrade he'll totally hate me, I still would like to be his friend but if we break up I don't think he'll ever be my friend or speak to me I feel horrabal.