Answer: jilter

AnswerCrossword Clue
JILTERLover who broke your heart, perhaps
JILTERAltar no-show
JILTER"Dear John" letter writer
JILTERWedding-dodger.
JILTERCallous ex-lover
jilterto reject (a previously encouraged suitor)
jilterone who jilts (to discard a lover)