how is it like to like someone?

is it..
-constantly searching for any topics to talk to him/her about?
-grabbing any opportunities for interactions?
-presenting yourself well in front of the other person?
-seizing every chance to get a glimpse of the person even if it's at the corner of your eye?
-wanting to find out more and more about him/her?
-or just wanting to see him/her happy?

things happen and i really strongly feel this way..
the topics he talk to me can be really random..
and can be something that you think no one would talk to you abt..
but just for your reply,
he continues asking..
feels awkward..
but i still replied..
truly, i can sense the effort put in to make me reply..
perhaps i can learn to ask quesiotns like: "how about you?" more often(: