Why does my female colleague who works in a hotel have a close relationship with me in private, but she never reveals our relationship or even just makes eye contact?

The reason I don't want to go public is nothing more than

First, I am worried about being asked to leave my job or affecting my work. Some units hold a negative attitude towards the love of employees in the same unit.

Second, you are just a spare tire. Maybe when you meet someone better, you can say goodbye. It is more convenient not to make it public.