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).
Overwhelming feelings make him nervous trying to impress you
Even if they feel confident and sure of themselves in other situations, it can be difficult to express those feelings when they have a crush on someone. So, it's natural for guys to act nervous around someone special.
Believe it or not, guys get shy around girls, too. It's not just us who feel like we don't know what to do around them. Guys get all quiet and uncomfy around us, too.
A friendly guy will definitely make eye contact during conversation—it's only the polite thing to do, after all—but if he looks at you randomly from afar, he's interested. If you ever catch him trying to sneak a peek at a part of your body other than your eyes while you do talk, he's definitely interested.
Guys tease and make fun of girls they like because they want to be noticed. Contrary to popular belief, guys always seek attention from girls—especially the ones they like. Guys try to hide the fact that they like the girl by teasing her. In a way, it's still flirting.
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.
A guy who likes you will always be nice and polite in his approach towards you and he will always look for avenues to spend more time alone with you and get to know more about you- either by going on a date, through constant phone calls or chats- the subtle signs are always there if you pay close attention.
They are interested in what you have to say and ask you lots of questions. They laugh at your jokes, even the lame ones. They initiate physical contact. They try to find space where you can talk more privately (this does not always mean sex, but it often means they wish for more quality time with you).
Physical flirts are big on touching. They'll lean into you, adjust their stance toward you, play with their hair or put focus on their mouth—this style of flirting is sexually charged, to say the least.
If you notice he is making more eye contact with you or you catch a guy staring at you, he is probably attracted to you. He may be enthralled by your good looks and may be fantasizing about kissing you. Perhaps he stares at you and smiles; that could mean he likes you, too.
Whenever you both meet, if it always ends with sex, it might be a sign that he is using you. If he is making time only to sleep with you, he might be interested in physical intimacy rather than a committed relationship. If you both meet and he just wants to jump your bones and then leave, he is using you for sex.
A guy might be sexually attracted to you if he makes flirty eye contact with you and can't stop smiling around you. He might also like you if he touches you often and makes an effort to lean in close to you. A man is probably sexually attracted to you if you catch him staring at you or scanning your body up and down.
Men prefer a woman who can stay calm and relaxed. Beauty is more than make-up and a fancy haircut. Men find women more attractive when they are neat and clean. Men find women who smell nice, who have clean hair and hydrated skin more attractive than a face perfectly covered in makeup.
Can you feel when someone is attracted to you? Yes. When someone feels you are an attractive person, some things come up between you that aren't there otherwise. The clues aren't always obvious, but you can see some of them by paying attention.
Looking into your eyes while you're talking (Eye contact flirting signs are really important.) Bringing you your favorite coffee or make excuses to see you. Being a shoulder to lean on. Putting other guys down, especially one of your love interests.
They will flirt with everyone and charm them, because that's just how they are. But when a man likes you, his manner of flirting will be quite different. It may be little, subtle differences, but they will be there. So pay close attention.