How do you know if a guy likes you or just wants to hook up?

If its been a few weeks or even months into seeing each other and he hasnt mentioned defining the relationship or setting more concrete labels, whether its being exclusive or being official, then it shows that he just sees you as a hook-up or a casual thing.

How do you tell if hes just trying to get in your pants?

8 Signs He Just Wants To Get Into Your PantsHe talks too much about himself. He puts no effort to know what matters to you. Hes not there for you when you need him. He tries to get uncomfortably close to you on the first date. His idea of a date is just to hang out at his place. He doesnt like to involve friends.More items •11 Dec 2015

What does trying to get in your pants mean?

(idiomatic, colloquial) To have sex with someone, especially for the first time. quotations ▼ My groupie has been trying to get into my pants for ages.