In a dilemma.. 😓

So, whenever I see my boyfriend, I ALWAYS buy dinner. He buys dinner VERY rarely. For the past few days, I have bought it and tonight he bought dinner for us. But out of the blue, he said “I’m always buying things”. He sounded annoyed when he said it. I mean, he’ll buy me snacks and stuff but as I said, VERY rarely. Anyway, we got into an argument about it. I just feel annoyed because I always buy him food and I don’t know why he’s being mean? I can count on my fingers how many times he’s bought dinner though..