"the friendzone"
I don't know if there's an official history of 'the friendzone' but this is the one I have heard.
(Please read the following like I'm telling you and old tale :blobcatreading: maybe we're sitting around a fire.)
Back in the early days of the internet, heterosexual men would gather on webbed sites and fora. There they would talk honestly about their relationships and philosophize on the nature of men, women, and their relationships. They would give each other practical advice.