My boyfriend is also a fitness instructor and has a good figure. I also started as one of his members. As you said, I didn't feel uncomfortable at all when he taught female members before I fell in love, but now I'm troubled.
There was a female member in the class yesterday. After practicing belly rolling, she lay speechless. Her boyfriend had to help her up. The point is that this woman has always been interested in him and chased him for two years.
But to be honest, in the long run, most fitness instructors can't take care of their families except the big brothers and rich second generation in the fitness circle. It was a widowed love marriage.
I have to say that there are many temptations from fitness instructors. Anyway, from a female member's point of view, you are exercising, and having a good coach around all the time is a bit vanity. Moreover, physical contact is essential at ordinary times.
Boyfriend said not to get too close to members. Once they cross the line, it will be difficult to do it later. As for whether what he did and what he said are in sync, I'm too lazy to delve into it. Anyway, I don't think he is a man who can resist temptation and has principles.
However, among the coaches I know, there are also people who are devoted to their careers and love fitness. This kind of coach is excellent.
Once the boyfriend is found to be having an affair with other female members, this kind of "ambiguity" is also meaningful, and it is acceptable if the boyfriend wants them to continue their classes. If not, then you should stop in time, or you will still hurt yourself.