He has this incredibly high-maintenance girlfriend; if he doesn't tell her that he loves her every five minutes, she tends to break down into hysterical depressive weepy fits.
Describes a system which requires a high degree of maintenance to ensure proper functioning and without which it is likely to break down
As a slang term, high-maintenancef may refer to individuals who require an unusual amount of personal attention or who expend substantial amounts of money or time on their physical appearance. It is not always disparaging, and some may describe themselves as high maintenance. The antonym is low maintenance. The term has been applied to personal grooming in many species of organisms, homeostasis, racing bikes, Border Collies, plants, relationships, women, Volkswagen, and many other subjects