you get a long time to process this at least. I know it is hard. I have lost many therapists over the years. Reducing sessions is kind of a good thing. I guess he is thinking by reducing sessions it will reduce your dependence on him. I had 10 months to process losing my last therapist before I moved and had between 3 weeks and more to process it with others. Use the time wisely to talk about your goals, what you learned, what you should work on and your feelings about the whole situation. Try not to leave nothing unsaid. I think it is a child feelings but in the long run i doubt if anything you do will change his mind. All you can do is grieve for the loss.