It's the way he is, not a "flaw" or problem. People run the gamut in how they like to work, play, interact, etc. and if he's most comfortable this way then I'd leave him alone to do his thing. There's nothing abnormal about how another person works and does things in their own life, only about what we're doing and how we like things in ours. If he's busy this month, I'd find something else to do, other friends to talk to?