Brother, my feelings like you very much!
I was also a green hand in the Night Club, and I'm also in the middle age. When I met with pretty "girl" in there, it grew in my mind with the thought to "protect" her instead of fucking her at the first instance. I try to make friend with her before go further and, have the mind that any sex is just coming after love!
Eventually, I come to understand the fact that many other CHing mentioned before as well.....How may "man" do they meet and talk in a month?(far more than we meet with the club ladies) What is their purpose of working in there?(money and living) Do they really want to work in there ?(no choice then)Do they like those lives? (of course not) Expecially those 清纯没有捞味的(I believe you like this type of girl, as I like too),they hate to live in that field and they don't want to be known they were in there.
When the one you picked felt your care as you invited her for romatic dinners(I believe that you are not taking her to the Cafe D' Carol) and/or movie but without asking for "more". You are really taking her heart with you as her heart is usually very brittle. She is really afraid. She therefore need to set the break .
Psychologically, most the Clud Ladies dare not to fall in love with anyone they meet and know in their working place (the Club). They know that you will never be serious in this game. They know that you have family and they also know that once you get their body, your fire in your heart will be diminished but that in their heart will be burning even stronger and stronger.
You better ask yourself a question: Do you really want to get your second half (a "wife") in there? If so, you had better tell "her" your intention and take her away from there immediately. Otherwise, you will be upset yourself again and again.
No serous love in there, this is the rule of the game. The story in those movies "pretty woman" and “up where we belong" will never be coming true in this Chinese society!
Good Luck!