Relationship mambo jambo

My partner and I have been together 3 & 1/2 years  and live together with 5 others but we share a room. I've currently been feeling that I want to leave him but when he gets super upset, he has smashed things occasionally and I don't want him to do anything bad. Also, I don't want to mess up the flatties because that's not fair on them. I don't know what to do. All I know is that i don't feel like we're a couple and I'm okay with that... Help please !