He likely could use some help if he is that moody. It's no one's job but my own to manage my mood disorder. He really should see a doctor to determine whether or not there is some medical reason why he is this way. He could be hypoglycemic, etc. But you're not a doctor, right? If it were me in your situation, I would suggest he see a doctor and if the way he treats you does not get better, I would insist. Sounds to me like you are "walking on eggshells," which is a term you can Google and likely get some descriptive information on what you are experiencing with this guy.