Couples argue, people are human and fallible, and the nicest person in the world is capable of being a realy jerk at times. Bear all of this in mind. you are not going out with some superior being, he's just a man and he might occasionally be prone to tantrums and nastiness, most people are.
what you need to do, and what you can do, is to get more of a handle on how you respond when people affect you negatively. Pleading with someone to stay gives them power, so don't do it. If this relationship is right it will withstand little tiffs, if it's not then being self reliant but leaving communication lines open will soon show it up as such. don't chuck anything valuable away just because your perfect man is less than perfect, but equally use his future behaviour to analyse how suited as a couple you really are and act accordingly, you are worth the right relationship.