Thanks for the support and suggestions, guys!
Forgot to mention that I've talked about this with him. The way he sees it is that he has friends of years that days pass by and they don't talk and that he's not supposed to reply or say something every time. (Yet, he answers and talks to others through Facebook and WhatsApp, and when we went out, he was a good chunk of the time...texting on his phone).
Then add the fact, that he actually asked me a few times to text him less. Heck, earlier when we met I had this..thing were I wished him a good day and good time at work, every day. Maybe a little too much, but we started talking and wanted to show him that I cared.
So, he asked me to stop doing that because it made me sound desperate and like a psycho. Ok, fair enough. No more good morning texts. Then around a month later, he shows me a pic of a guy he was talking to (and that's another story!) and proceeded to talk about how he was falling in love with that guy, because he...texted him every day to wish him a good day and good time at work. :/
In some ways, is why I decided to also not text or contact him recently. I didn't wanted or expected much, even a simple no or a smiley when I texted him something would've been enough (Wanna drink/watch/play something? No?!, okay..maybe another day, take care! Yeah me too?!, thanks!!). He even said that he read most messages, but didn't replied because he didn't had to.
Then, there's a friend I've known since I was 13. We talk randomly, again I know and don't expect to talk to friends every minute. He's also the only person that noticed as far as to contact me wondering why didn't posted anything on Facebook in two weeks (a month now and still; only him). Two days later, he called and came by to talk and play games.
It was simple, yet meant much and felt nice.
But, yeah. Guess I'll just leave him be. He knows were I live, work, my dad, my dog, well... everything about me. If he can't or don't want to be bothered to say anything, I won't talk to him and therefore pressure him into doing so. It really sucks because he is a great guy and when I see pics of him around and smiling (like the ones he posted today), I get all this...nostalgia(?!) while wishing he just talked to me, or something. Not to feel like just an option or granted. :/