If they're young to about the age of 14/15 - they annoy you, coup de poing you, pull your hair but also like to talk to toi whilst calling toi names. If they're older say 16-20 then there are differences. One side of them acts up in front of toi to look 'cool', like messing around with their Friends pretending to beat them up, doing tricks on skate-boards etc, ou drinking large amounts of alcohol to look 'big'. But the other side does this - 1. a boy will play with his hair, cuffs of his shirt, his chemise collar, tweak his trousers, try to buff his shoes and clean his fingernails whilst talking to you. 2. he will look into your eyes then away and then back into your eyes, licks his lips constantly, leans in as though to Kiss toi ou smell your scent ou touch his lips with his fingertips 3. positioning of the feet - if a boy likes toi both feet will be pointed at you, if he is unsure how toi find him and thinking about making a quick get-a-way, one foot will be towards you, the other off to the side 4. they'll fidget constantly, rubbing the back of the neck, playing with hair (etc), ou laugh after their own jokes and ask question after question giving toi barely enough time to answer properly 5. he will agree to (almost) everything toi like ou are opinionated on 6. (in school) will start to 'bump' into toi par accident, helping toi out with school-work, picking things up toi let fall 7. (out of school ou at work etc) - will begin to 'follow' toi to 'bump' into toi to get to talk to you. <- stalkerish i know but boys get nervous around girls they like and some lads like to get to know your habits before making their déplacer so they don't end up making a fool of themselves XD
for one thing u hav to look pretty and b into stuff he likes and he usually smiles a little when he talks and he will look down when he talks and if he talks sto u infront of his "possy" then well thats usualy bad news but if its a u to him confersation txting ou talken then go 4 it just dont ask infront of his "possy"
They pick on you. They look at toi all the time. They joke with you. They get embarresed when toi not something that toi don't like about them. They like doing favors for you. They ask toi lots of questions. They look jealous when you're with another boy.
Usually it's pretty obvious. He'll make a big deal about talking to you. Younger boys are usually too embarrassed to talk to girls because their Friends will pick on them for liking someone, so when they talk to you, it's usually making fun of you. When you're little and a boy kicks toi ou pulls your hair, he's trying to get your attention, not be mean to you. But as toi get older, boys who do that are actually making fun of you. I know this from experience. Older boys (high school, maybe later middle school even) would probably make a big deal about talking to toi par trying to get your attention in nicer ways, like sending fleurs ou putting a note in toi locker, maybe even trying to confront toi directly. They'll usually get very embarrassed trying to talk to you. They might try sending toi a l’amour note, but boys seem to be a little less... "poetic" than girls can be with l’amour notes. Some boys spend whole nights trying a million times to perfect a l’amour note, sometimes even a few days. It typically ends up turning out to be a bit embarrassing anyway, so they usually send it anonymously. And also, a boy that likes toi will typically get a little clumsy when around toi ou make a total fool of themselves (or plus than usual, at least XD), they may even blush when around you.
^Most of this information was taken from literature. I've never had anyone who was in l’amour with me before, so I wouldn't know this from experience.
HOWEVER, if a boy immediately comes on to toi and starts flirting, odds are he's bored and is just a big flirt. Now that, I learned from experience. Well, sort of (he flirted with my friend, and meanwhile he's dating AT LEAST two other girls and has every 12-14 an old girl on the bateau wrapped around his finger... oh sorry, I forgot to say, this was on the cruise I went on just recently.)