Don't maintain any relationship you've already paid for.

There's a gym downstairs, with a coach who is quite skilled.
Every time I go, I specifically ask for him, and later I couldn't resist his persistent pestering.
I just got a membership card, and before signing up, I was served tea and water, with towels and massages all given to you.
After signing up, everything changed. When I want to book his class, if the schedule is full, I either practice on my own or book another coach.
He privately approached me and said: Brother, from now on, schedule a class with me two days in advance so my performance looks better and I can earn a bit more.
I thought it wasn't a big deal, so I agreed. I booked a class at 7 pm,
He said the previous student hadn't finished, so I waited in the lounge for half an hour. He apologized sincerely, saying how difficult his situation was.
Thinking that less trouble is better than more,
One time, I didn't make an appointment and just randomly found a coach.
I ran into him face-to-face. Do you know how I felt at that moment?
I actually felt guilty, as if I did something wrong and got caught.
A person who paid for a membership card, didn't book his class, and still felt guilty.
His face looked very unpleasant at that moment. I could only say, "Oh, I came without an appointment."
He sneered, and the coach beside him was stunned. Several people in the lounge looked over.
I instantly got angry and asked him, "What are you laughing at?"
He hesitated and said it was nothing.
The manager heard the commotion and came over.
He changed to a pitiful look and explained.
I directly told the manager, "I paid for a membership to enjoy the service, but I have to look at his face.
Give me a solution."
In the end, the gym deducted his performance bonus and made him apologize to me.