it mean's he want's to own you good or bad. it's his ego and pride and selfishness...
sounds like he has issues with his feelings towards you.
You are seeing the anger, hearing the hurt. It's personal between you and him.<br />
But he owns that and not a poor opinion of YOU, so neither will he allow his friends to air negativity about you.
Power trip, tell him to keep away until he learns a bit of respect, don't put up with this behaviour, he obviously likes to intimidate you and show his power in front of his mates. Wake up and stand up for yourself.