Guys, He asks about me but never talks about himself. Why?

There's this guy I used to date. When we dated, communication between us was really bad. He used to be very evasive and it would drive me crazy. We decided to stay friends. Recently, we've been in contact more frequently and he's been so much more attentive. He asks me questions about how I'm doing. When I'm down, he actually listens and tries to cheer me up. All things he didn't use to do before. The only thing: when I try to ask him about anything going on in his life, he shuts down. He doesn't respond and/or ignores my messages. When I ask him why he doesn't talk about himself, he doesn't respond either.

He has a girlfriend. And even though it irked me in the beginning, I'm happy for him now. At first I thought he was uncomfortable with me asking about him and his girl. But it's clear that he just doesn't want to talk about ANYTHING that goes on in his life. Even the dumb stuff, ex: what did you do today? He'll ask me any old thing about myself (especially my love woes), he'll compliment me, we'll joke around. But if I do the same for him. Nothing.

So I want to know: Why does he ask about me but never talks about himself? Any clues?

Does this mean I should walk away from this friendship?
Guys, He asks about me but never talks about himself. Why?
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