oneitis

noun

1. (slang, uncountable)Attraction towards a single potential partner to the exclusion of other possible partners.

   “Oneitis is more likely to attack chicks than dudes for reasons of biological conditioning, habitation, mother-child relationship and other scientific crap.”

   “But in the past eight months, I hadn't felt even a tremor of oneitis. In fact, every woman I met seemed disposable and replaceable.”