Even the most discreet expression can grab your crush's attention. Compliment their outfit, or smile and say hi when you pass them in the hall. After school, keep things flirty over text or Snapchat.
If a boy really has a crush on you, then he'll be likely to give you all of his attention. He'll turn his body toward you, make eye contact, and won't look around for his other friends or text them during your conversation (unless he uses his phone as a crutch because he's nervous).
Ignoring a guy is one of the surefire ways to get his attention, as he would at most times try to win your attention back. However, ignoring alone doesn't put you at the forefront of his thoughts and make you desirable.
You will often witness a spark in their eyes when they are looking at you or having a conversation with you. They will smile at you as if you are art personified. You can tell if someone likes you if you can sense them looking at you even when you are pretending not to notice.
Often, the best way to discover if you have a crush is to check in with yourself about how you feel. If you think about the person often, want to spend time with them, frequently wonder how they're doing, and are interested in knowing all of the details about this person and their life, it's likely a crush.
Dress to impress. If you're that kind of girl (if you are a girl), wear a floral dress when it's hot out, or a cute black sweater when it's cold. Wear clothes that accent your features. ...
Be clean and have good hygiene. Shower at least once a day. ...
Smile. Smile when you talk to him, or when he's around.
He'll stand close to you. He might place his hands on you casually, like touching your arm or your shoulder when laughing at a joke. “A guy who holds your hand or puts his arm around you is showing interest. We don't tend to touch people we don't like, so touch can be an indication of attraction.”
If he compliments your eyes, the color of your hair, your laugh, or an admirable aspect of your personality, then he's definitely flirting with you. He may even tease you a bit while flirting with you, like if he says something like, "That's the brightest sweater I have ever seen," but he's still flirting with you.
We often develop crushes on people because we feel they might fulfil a need that isn't otherwise being fulfilled. This might be a need for love, attention, sex, friendship or any number of other things.
What is the easiest way to tell your crush you like them?
Make eye contact when you're talking to them, or hold their gaze for a couple of extra seconds when your eyes meet in the hallway. You could playfully tease them, or send a flirty text after school to let them know you're thinking about them.
The reason why crushes feel so intense is that the person with the crush craves deep intimacy with their object. It's the kind of closeness that is difficult (but not impossible) to come by in friendship. Imagining that intimacy is euphoric. But with true intimacy, you get to see the best and worst in someone.