So this guy I like, knows I like him, and he picked this girl up (we were sitting in his truck with another person as well. ) and he picked her up in front of me and like looked right at me while he did it.
Is he trying to make me jealous? If so, why would he?
There's no way any of use can answer that question because we don't know your history with this man. With what you've said I don't see any reason why he would try to make you jealous. Maybe he doesn't like you, so naturally, he's not going to pick you up, but someone he might like more?