He finds ways to talk to you and be around you as often as he can. He takes the initiative in trying to spend time with you, or failing that, calls you, texts you, or asks about you often. Even if the guy is socially awkward or nervous around you, you’ll still notice him hanging around a lot. The key here is that he’s taking initiative and making effort. If you feel like you’re chasing him, he’s probably not too interested.