From Longman Dictionary of Contemporary Englishjiltjilt /dʒɪlt/ verb [transitive] RELATIONSHIPto suddenly end a close romantic relationship with someone She jilted her fiancé just before the wedding.→ See Verb table
Examples from the Corpus
jilt• When he was jilted after five years together it had a devastating effect.• Anyway she was off to jilt another fellow; his name is Percy.• Grace Bird is an abandoned wife and Babs's Stanislaus has jilted her.Origin jilt (1600-1700) jilt “woman who ends a relationship” ((17-20 centuries)), probably from jillet “girl who attracts sexual attention” ((16-19 centuries)), from the female name Jill 