How can I stop being so jealous of my boyfriends best friend??

He is constantly on the phone to his best friend. His best friend always comes first in my boyfriends life and whenever his is around I seem to be pushed aside and I hate it. Am I just jealous? What should I do? My boyfriend changes when he is with his friend and speaks to me horribly, just as his best friend treats his girlfriend.
How can I stop being so jealous of my boyfriends best friend??
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