how do you know

Try ignoring him, c whether he tries to chase u. Tats d solution

im a guy,,,just pay attention to changes in the tone of voice when he talk to you and compare it when he talks with someone else,,,just watch the way he looks at your body,,,like he have a desire with you,,just check if he calls you a lot,,,,it could be the situation when the guy is sooooo shy to talk to you and when you see him with other girls he talks like nothing,,thats another way to see if he likes you!!

just check how he deals with you and others. checking eyes is hypothetical

The way he look at you.