from wat i know, females r more affection creatures, they'll be
frenly, caring etc.... no wonder who u r, of cus must be frens lah.
they can be veri close to u, calls u etc... jus cause u r her fren,
so guys, pls dnt tink someone being frenly means she likes u.
to add further, often pple tinks gals r veri sensitive & gd in
sensing who likes them but the truth is, they themselves have no
clue about it. So wat makes them able to tell so easily?
the answer lies with the guys themselves. jus as females r opps for
males, so does females being affection creatures r opps for males
being not so affection. guys will normally not be so close, so nice
or caring to pple ard them & those they dnt give give a dam
about. they'll change their way of treating pple to those they have
a fancy on. so when a gal sees tht tis particular guy treats her
better than the rest, she'll know veri easily 
personally, i've tried to conceal my feelings for tis particular
gal cause i know she's too young for me at tis stage, so i jus
wanna build the relationship, i was doing a veri gd job bout it
until she found out cause some kaypo (my grp of guy frens) go &
tell her bout it, tinking she prob knew. haha, she was completely
shocked