It sounds like you two had more of a personal relationship than a proper therapist/client relationship (all his fault- not yours)...which makes me think that he is behaving this way now (cold, indifferent, etc.) as a personal defensive mechanism of his own - like you might see in a romantic/personal breakup rather than a therapy termination.

His current behavior is not uncommon at all when viewed through the lens of a personal "breakup", but it is very surprising, damaging, and inappropriate in terms of a therapeutic relationship.