I have been with this guy for about a year. I like him, but his anger and paranoia is kinda scaring me away. He is constantly accusing me of not wanting to spend time with him, or cheating on him, or just generally having some ulterior motive in everything I do. He gets angry and argumentative, and I feel I am always trying to "redeem" myself, prove that I am not some terrible selfish bitch who is just using him. He admits that he is paranoid, but feels that this means I have to be extra honest and careful, so as not to provoke him. The rest of the time, he is funny, generous, and extremely intelligent; but I am exhausted with this behavior, especially as I was in an open relationship with my last partner, who was extremely respectful of my privacy and trusted my word.
Is there something I can do to improve this relationship? Do I need to get tougher ("you either trust me you don't have a relationship with me" type of thing) or just find ways to help him trust me?