>>52331832The groom, was supposed to groom his bride, treat and raise her in ways that she would end up falling in love with him and be devoted to him.
And if we go even more monke, the term groom refers to bonding with another primate, which happens in monkes, chiefly via the act of picking up stuff from their fur and cleaning it. The emotional significance of that behavior is however, in the bonding that happens between the two primates.
It is outright evil, how the modern world has twisted the concept of grooming into being something inherently evil. Grooming is the very basis of formation of long term social bonds between humans, especially pair bonds. Without grooming, you will end up with shallow relationships that are based purely on hedonism and material benefits.