Lovesickgender used to have no meaning beyond a flag. On October 22nd, 2020, a user going by Angel formed a definition to fit the flag and term. The term was first mentioned on June 19, 2018 by user All-Prides-Matter.
The name was changed by FANDOM user Keterodyne on February 9th, 2021, due to concerns about ableist implications of using the term "Yandere".
The flag was created on June 19, 2018 by the moderator of a now archived site. The flag doesn't have a defined meaning.