Why did he reject my hug?

So this guy likes me pretty obvious he’s always making physical contact and touches my waist etc even put his number in my phone just very obvious stuff that he likes me but today when he was leaving and about to give me a fist bump I asked why he never gives me a hug and he awkwardly blushed and laughed and asked what’s wrong with a fist bump and I asked what’s wrong with a hug and he went silent just acting weird and goes maybe next week you’ll get a hug and gives me a fist bump and leaves like wtf does that even mean if he likes me what’s wrong with a simple hug

Why did he reject my hug?
Post Opinion