Question...

If a guy seems to like you, why would he ignore you for a month, and then call you, but won't talk to you when you see him later...?

Thats just guys for u! Most guys are like that, they seem to think us girls are just toys, and that they can do whatever they want to us. But what they don't realise is all the damage they do to us. They don't see how much they nock our confidence down.
He's probably just still immature, and needs to grow up. Ask him about it!

Yurp, that's the man's way. it's a lack of confidence in himself by the sounds of things. Of course, one can't make a proper judgement with so little information.

Why not invite him somewhere away from where he usually hangs out where people he knows are?

Just a cup of coffee of something simple. Then you can start getting into his head and opening him up a bit.

because guys are confusing!