Guys, would you block a girl you like on whatsapp or hide the "last seen?"?

[Felicity Alvarèz]

Hi,

1) We exchanged numbers and talked only for a day, you know.
2) Then we didn't talk for three weeks or so.
3) I messaged him but backed off because I didn't want to be needy, clingy etc.
3.5) I also told him, if I got annoying, he should tell me, so I assumed that when he didn't text me back, he needed his free time
4) Today (after about three weeks) he asked: "Dude, what's wrong with you?"
5) So to show him that it was not good that he ignored me, I said: "??"
6) Right after that, I couldn't see his "last seen" or anything.
7) You might say he blocked me, but you can also hide the "last seen".

Now I have a question; why did he block me/or hid the "last seen?"
Was he nervous? Did possibly his friends do that? And if you would do so, why?
He knows that I am a calm relaxed person, so I do have things to do, just for people to know who are going to say "Don't you have something better to do?" or so.