Theres this guy I think about constantly (literally all day every day), he's really good looking and he says he enjoys spending time with me (he's the type of person who's way too honest so I really trust him!)

I can't tell if he's my favorite person or if I have a crush on him because, as an asexual, I can't imagine myself having a sexual relationship with him but I do want to spend all day with him and know everything about him and maybe even kiss him ? but I don't feel the desire to do that if I'm being honest, I just want to feel like I am the closest person to him.

He triggers my black and white thinking, by the way. Sometimes he does something that means no harm and I take it to the extremes and feel like I hate him and want him dead, but these thoughts usually last like a day and then I cringe because of how irrationally angry I was before.

Is there a way to differentiate between a crush and a FP? I don't think I have felt this way before...