Boy troubles

How do you know if a guy likes you? How to know???? Everytime i talk to him, i try to look for body language signals, any possible indication that he likes me too. But his posture is always so rigid and most times, his feet ain't pointing at me when we talk. But he always stares at me, and he waited for me yesterday to walk home together! Even when he had a project to rush for when he gets home! I don't know... Why can't the guy just tell me if he likes me and we'll date, i'll definitely say YES