We argued and he blocked every way of communicating to me. How to make him talk to me now? I don't want to look desperate for it, but I want him to talk.. how?

Since you have no control over what he does, you can't make him talk, you have to wait until he wants to, but don't wait for it to happen. You ignore him the way he is ignoring you and act like nothing has happened. Do your own thing, and enjoy it.

How old are you both, and what was the argument about?

He's out of the country now.At first it was good,we talked regularly,bt now he's a kind of tensed.. We keep on arguing on small things bt this tym,he said he is a looser,he can't make anyone happy neither me nor any of his other frens or family.. and went away.. I don't want to end this way.He is not a looser and I am happy with him but every time its not worth to explain him this.He must have the confident that he can make everyone happy at least me, how can he judge himself without even asking me I was happy or not?

I think you exercise some patience, and sensitivity to what he is going through. The distance may not be of help, and I am sure you miss each other, but don't panic. Given the situation, enough time to adjust must be given, so while he is a bit petulant now, give him a chance to gather himself.

I know you worry, ut try to stay calm, and give him a chance to get that same calm.