Business is the practice of making ones living or making money by producing or buying and selling products. Business has its own ethics, rules and regulations that guides it and it should be applicable always. It always is but sometimes considering the relationships we tends to overlook something's in as much it is applicable to A is also should be to B.
Some people tends to keep straight and act as they are supposed to whereas some also don't but in all, things should always be done in a moderate way.
I have a Teacher then that irrespective of the relationship between you and her, the kind of close in which you are to her that's outside, in the classroom she keeps her heads up high and do that in which she is really are supposed to do and also expect the same from all equally. Outside you and her may continue but for that moment the rules is applicable to all.
It really makes people to know her for that, maintain her rules and regulations irrespective of who you are to her. A standard should be maintained in all sundry as individuals, the Love and care is still there to people but for the moment there is a standard that should always be applicable to all.
Treat people nicely and equally in your dealings it reflects who you are and that good behavior would always speak good words on your image
Always know that business is business and should should be and be nice in your dealings.