There is a reason why the cat is biting him. Is he trying to pet the cat when the cat doesn't want it? Is he trying to pick the cat up and the cat does not like it? A relationship with a cat has to develop over time just like with a person. Cats are not small dogs. Their love and trust must be earned. Your bf needs to want to get along with your cat and must be willing to let the cat come to him instead of trying to force the cat to be his friend. I noticed that you do not seem to be having the same issue with his cat. What are you doing that he is not or vice versa?My cat has bit him three times already & he doesn't trust him at all. I wouldn't trust his cat if his cat bit me like he got bit. Not a chance.