one guy

I don't understand, I met this guy and he sent me text on facebook. I replyed and asked him some questions, and he didn;t replyed. Why?

Maybe the questions you asked him, made him think you're a complete moron. I can't say for sure though, all I have to go on is the question you just asked...

Maybe he's busy and didn't check his facebook, or maybe he just decided he wasn't interested.

Specifics could help us answer better.
Where and when did you meet him?
Were you drunk at the time?
What was his general behaviour to you when you met?
Any other details that may be useful to know..
Atm it's a complete and utter guess.

I asked him simple questions how is he....
In my opinion it is rude not to reply whether he is interested or not

I wasn't drunk when I met him.. I asked his number, he gave me. He was smiling at me and looking me..

How old are you and how old is he ?

How long has it been? Maybe he didn't check his messages yet.

I am 22, and he's 30 it has been one day

You have his number, call him and see what he says. Don't act desperate. If he don't answer leave a message. If he doesn't call back in 48 hrs, burn the number and move on. Don't call him again !!!

I forgat to mention that I first replyed him after two days.

He is 30, so he very well could be busy. I know people who don't check their computer for days on end. And even then, it is rarely to go onto Facebook or check personal email. Some people are just not that into the cyberworld.
Plus, if you think it is rude that he would not respond to you, then forget all about it. Why would you want to be with someone you think is rude?