Be clear about what the problem is. Before trying to argue with someone and come to a solution for whatever the problem is that the two of you are having, make sure you understand what's really bothering them first. Sometimes people seem mad about one thing but really they're mad about something else. If you want to really fix the problem, it's a good idea to make sure you're working on the right problem first.
For example, your boyfriend might say that he's mad you decided to go to the big state school in the next town over instead of going to the local college with him. Of course, you'll still be able to see each other all the time and date without serious problems: what he's really worried about is that all that time off on your own will lead you to meet someone new.