Most Helpful Guy
Most Helpful Girl
People often want what they can't have.
When he thought you didn't have anyone else, he was like "Meh, whatever."
But when you became someone who had moved on, someone who had someone else, he's getting a little jealous and wants what he can't have (even if he doesn't REALLY want it, people often come out of nowhere when they know you have someone new).
I would continue ignoring him, if I were you.