jilt

Jilt traces back to the English dialect noun jillet ("a flirtatious girl"), itself from Jill or Gill (used both as a proper name and as a noun meaning "girl") plus the diminutive suffix -et. Jilt itself came into use in the second half of the 17th century as a noun meaning "an unchaste woman" (a sense that is now obsolete) or "a woman who capriciously casts a lover aside," and also as a verb used for the actions of such a woman. These days, the person doing the jilting can be either male or female, and though jilt usually implies the sudden ending of a romantic relationship, it can also be used beyond the context of a romantic relationship with the broader meaning "to sever close relations with."