Boyfriend problems

So me and my boyfriend have been going out for 6 months now and I love him like crazy. But I only get to see him twice a week but when we see each other we're happy as we could be but when we don't see each other we kind of argue. He is the sweetest guy I've been with but at the same time I'm getting tired of this arguing over dumb stuff. He talks about us getting married and moving in together and all the sweet stuff and then we talked on the phone and he gets mad about nothing and hangs up. What should I do so that we stop arguing as much?