A friend is making things difficult between me and my girlfriend.

Basically I have a girlfriend who I really like at the minute and I have another good 'friend' who is really annoying me. He is annoying me because he calls at my girlfriends house?They were friends before I started going out but since I started going out this guy has started becoming a lot more friendly with my girlfriend. He also said "I bet you both will break up soon". My girlfriend also never gives over about him...it's really..really getting to me. I actually head butted a wall about half an hour ago because of it. What should I do? Please help :(

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