Boyfriend help

So i recently told my boyfriend that this weekend I’m going to my best friend birthday dinner and he recently asked me to go to his brother game but i have work and don’t get off until 3:30 and the game starts at 2:45 then i told him my friend birthday dinner is Saturday and he says to me “Stop talkin bout it mane, I can’t see u dis weekend juss leave it there” i just don’t get why he gets mad when i hang out with my friends but he gets to hang out with his friends 😕and i saw him all last weekend