how can u tell whether u have a crush or u like someone?

how does "chemistry" created?

really have alot of questions running in my head cuz of my unnatural, unusual and unexpected behavior happened 2 me this few days.

i just gotta know him for like less than a week, but i'm just so "opened" to him, i don't feel any boundary when i talk to him, as in like i feel good and i just find him and what happened this few days are just "resemblance" of dear (adrian)! i dunno why i would talk to him like i used 2 talk to adrian... and i just find that he is like a younger version of dear.

he smokes (lightly);

he drives;

he is funny;

he teases me;

he is quite "plump" / "round";

and i'm pretty sure he's interested in me... there is just so much similarities about him and adrian.

To my surprise, i just feel so comfortable with him, even thou he'e in taipei, we two just keep sms each other (this was how adrian & i started), we kept teasing each other (can say it's a kind of flirting) i mean it just seemed so natural to respond this way! come and think about - i'm alittle scare! it's just too fast and coincident! i cant explain that myself as well. but on my side, i do wana talk to him, cuz he is funny?! someone whom i dun really know but just feel like we knew each other for very long already! (even zhen sheng - my fwen - oso said so!) this is really something! but what is it? dun tell me i like him as well? i admit i enjoy his company and fun, but this is happening too fast!

What's going on?