I agree with Harley and Lynn. In my opinion abuse does sound like the most likely scenario to me, but like others said, this could all be caused by him realizing certain things about himself, like having feelings towards other men. I would definitely confront him. Do it when both of you are relatively calm. Tell him you are concerned and worried about his behavior. Talk to him about how you really want to trust him but the way he is acting is hard for you to understand. It's okay to ask if he's been hurt by someone, or if someone has said something that upset him. I think you do really need to talk to him to further investigate if he is likely to harm you. You could suggest interest in talking to a therapist about some of the issues you are having and was wondering if he would go with you.