Amy there's no doubt in my mind that seeing him every day makes it difficult for you to move on. Also that he's acting arrogantly, whether he's aware of it or not.
If you were going to work on something, being assertive when he is disrespectful might be helpful, but it's difficult if he's determined to behave this way. Try not to do more for him than you need to though, he doesn't deserve it.
Is there any way you can plan an exit from the business?