Most Helpful Guy
When it's over, it's over... There's no need to say hi or hug or make small talk... it's not like you guys left each other on the best of terms... And I'm sure there's a bit more to the story, but in any case it sounds like to me is that he may be embarrassed perhaps even have feelings of a love loss, really kind of hard to say without knowing all of the intimates involved... But one thing is apparent, and that is he wishes to avoid you, childish or not... It's over and some people just wish to avoid confrontations with ex's in which they have to pretend to be OK with you and whatever happened :/
Most Helpful Girl
It's just he doesn't want to keep contact. Maybe he is still mad but who knows.