Bf off to clubbing?!


So it's a Saturday night, and I'm just in bed, and my bf texts me saying he's going clubbing with his cousin?! Wtf he's never been to a club. I'm hurt and confused, should I be worried? I'm so mad and hurt just the thought of him drinking and going to Hollywood clubs. He's so sweet and he's never disrespected me or hurt me before (we've been together for a year). I know I should value the fact that he was so upfront about it, he could have just hid it from me.. so why am I so damn upset?