Why would a guy do that, I am SO CURIOUS!?

[kate]

ok, so ive had a crush on a guy, lets call him Nick. i met him about 5 years ago, online. we met in real life (we happened to live like two blocks away from each other - and here in greece blocks are not as big as america lol) and.. well, nothing really happened. we kept in touch, talking online etc, flilrted a bit, i declined few of his proposals (he invited me over to his place for the weekend but i did not really know him back then - he also told me to wait after he's finished working , he was a bartender and finished around 5am so i couldnt wait)
and then one day, he gets in a relationship. we keep talking, meanwhile i have a crush on him, he knows, but does nothing (of course) but we kept in touch again.
LOOOOOOOOONG story short, we had a fight because I texted him (SMS) and he asked me to never do it again, so we stopped talking from then. about 1 and a half years passed from then.
a few days ago i added him on facebook (after he had blocked me, un-blocked me, then i blocked him and un-block him).
-oH i forgot to mention my best friend added him on facebook and he now has her on his friend list-
so i add him on facebook too, he does not accept, neither decline BUT only likes TWO photos of my friend which I took (I'm a photographer)and actually are in my profile but he can see them because i've tagged her.

WHY?