“Ruby targets authority figures. Maybe it’s a parental kind of affection for you, Ruby. Or maybe it’s a hopeful romantic affection.”

^I had another thought about this. I hope this gives you some insight and helps you, Ruby.
Could it be that the GMs represent someone you respect, as they are more important than the regular coworkers, and you ‘look up to them’? So, their liking you and giving you affectionate treatment makes you feel more special and important? Not necessarily parental or romantic…rather a sense of importance.