Why is my personal trainer mad at me?

I been training with my trainer for about 4 months now. In advance I told him a month before that I would not be needing training anymore after my last few sessions with him. I’ve already paid him in advance for my full month.
I recently just ended training with a week earlier than the date I told him. As I’m telling him that today was last day training with him, he then walks off while I’m still talking.
Whatever did I do to him?
He’s already paid I don’t why else he would be mad at me for wanting to workout by myself now.
Why is my personal trainer mad at me?
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