Most Helpful Guy
I can relate to your situation. The on and off long term relationship that broke up it seems...eons ago. Yet the feelings linger on and on. I would liken the feeling to what it must be like to have an Ex wife (or husband).
He likely does not want to be reminded of what he could have had with you. He wants to focus on his current GF. His current Girlfriend could be the jealous posessive type and insist that he not talk to you...etc...etc...etc.
Just give him time. Odds are given your history he will be back in contact at some point.1THIS IS NOT RELEVANT ANYMORE