Make certain movements to check if he is imitating you. When people listen intently to others, they subconsciously imitate their body language. Next time you have a conversation with someone you're interested in, do certain things. For example, you could fold your arms, place a hand under your chin, or lean forward.
When he imitates you, he focuses heavily on you. Sit closer to see if he is comfortable with it. Next time you're together, try this and sit closer than you normally would. Then, if it seems appropriate, lean toward him. If he withdraws, then he is less likely to be interested in you. If he doesn't react at all or hardly reacts or repeats your gesture, then he might feel something for you. If it doesn't make you uncomfortable, touch his arm or shoulder.
Run your hand over his to break the barrier of touch. If previous approaches went well, you might “accidentally” touch his hand. If he quickly pulls away or acts surprised, then he's probably not interested in you. If he doesn't pull her away right away, then there's a good chance he sees you as more than a friend. If you're too nervous to touch his hand, work up to it by touching his shoulder or arm.
Ask if he is interested in you
If a guy responds positively to your romantic advances, ask him directly if he likes you. Then give him a chance to think about it. If he is genuinely interested in you, ask him if he would like to go on a date with you. If he's not interested in you or isn't ready for something serious, apologize for misreading the signs and that it's OK with you if you stay friends.
When asking the initial question, preface it by saying you've received romantic hints. For example, you could say: “I feel certain vibrations from you and wonder if I'm right. Are we just friends or is there more? If the guy says he's not interested, give him some space. Things may feel a bit strange at first. But your relationship can eventually go back to normal.