Can you tell us any more about him as an individual? Did he just start doing this or has he always been nitpicky or quick to anger? Is he stressed out at all? Any history of depression/anxiety? Is he happy with most things in his life? His accomplishments, work, social relationships, etc.

His constant accusations of not being able to trust you are a red flag, though. He either has some issues with abandonment (especially if any of his previous girlfriends have cheated on him or if he is a child of divorce that resulted from infidelity) or he’s doing something he’s afraid you’re doing, too.

No matter what, though…. make sure you are sticking up for yourself when he does these things. Do not allow him to treat you in a way that you do not deserve.