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Observe how he acts when you're around and when you're not around. Think about whether or not he seems nervous around you. Read his body language. Think about his social media behavior.
Of course, it may be hard to find out how he acts when you're not there, but try to observe him from afar. If you see him across the lunch room, see how he is acting with his friends. Is he talking a lot or is he quiet? If he's very talkative around other people, but quiet around you, there's a good chance that he feels nervous about saying the wrong thing in front of you. If he is a quiet person all the time, it may be hard to tell this way. Look for other ways to know if he likes you too. When you're around does he avoid looking directly at you? Is he sweating? Is he defensive if someone teases him? If he is not normally like this, but seems to be when you're around he may be worried about doing or saying the wrong thing in front of you, especially if he is shy. If a boy likes you, he's more likely to seem as though he is nervous or anxious when you are around. If he isn't really in to you, he will be more stand-offish. A shy guy is likely to be fidgeting with his hair or his clothes when you are around or he may cross his arms in front of his chest. Shy boys are more likely to feel nervous around their crush, so they may seem defensive, when in fact they are actually very interested. You may find that your shy boy often tries to be around you, but not really near to you. For example, he may find excuses to hang out with your group of friends, but he'll always try to sit as far away from you as possible. Don't take this as a sign that he doesn't like you. If you are friends on social media, think about how he treats you. Did he find you and friend you? Is he constantly liking everything you post? If so, there's a pretty good chance he is interested in you, but hasn't gotten up the courage to do anything about it. You can also try to hint to him that you're interested by friending him (if you're not already friends), and showing appreciation for his posts by liking them or making a comment. Don't overdo it though! You don't need to like every single thing he posts, rather just a few to show him that you are paying attention.