I know what you mean about being 'sick of relationships not working'...but girl, Ive found that being lonely and searching is a HELL of a lot better (doesnt feel so rite now maybe) than living with someone who is ACTIVELY and CONSISTENTLY (purposely or not) causing you grief, heartache, and confusion, and worse od all, helplessness.
It mite take some time where you feel alone and weak, but, thats what friends are there for. Seriously... DONT keep yourself somewhere you feel at a disadvantage and HAVE this dude LIVING with you. You maybe should think about booting him for a trial...to clear YOUR head and get AWAY from him... u cannot make clear desicions if you are still with him, especially physcially living together. Or move yourself... seems like you just gotta put yourself AWAY from this situation, mentally or literally. Sounds shady and you probably dont want to believe it but sometimes your gut is so right.