Because there is no eternal friendship in the workplace, only eternal interests. Driven by interests, everyone will open their eyes and look for other people's shortcomings with a magnifying glass. The relationship between men and women has always been the most sensitive topic. Maybe they don't realize it themselves, but others have been talking behind their backs. Although there is no real evidence, people are worried after all.
The relationship between male and female colleagues is purely a colleague relationship, and you should do whatever you want at work. Once you get too close, you will always be influenced by some feelings at work, which will unconsciously affect your work. Once we encounter a critical moment such as promotion, we often consider it comprehensively, and gossip is often a fatal factor.
Especially in the same unit, people often pay special attention to it, because other things are generally difficult to consider, and this kind of thing will also cause special resentment of leaders, especially in units within the system. This is a taboo, which often has a great impact on career development and sometimes brings great sequelae.