Wtf why is he like this??

So I’ve been hooking up/talking to this one dude for a month and a 1/2. I thought it was just a hookup but we always hang out and he’s introduced me to practically all of his friends. We just went on a weekend trip with his friends. Yesterday I posted a pic on snap and he replied to it later saying he wants to do things to me. Today, I texted him asking if he wants to do anything tomorrow and he kept messing around saying “why”. I was trying to be serious and he kept joking around. I ended up double texting but he never replied. I know he has to get up early in the morning but I hate when he messes around like this. He’s done this before but it always messes with my anxiety. Why does he joke like that??