an old flame

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an/(one's) old flame

One's former lover. How am I supposed to forget about my old flame if I keep seeing her around town? Yeah, Ben is his old flame—they dated last summer.
See also: flame, old
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

an old flame

COMMON An old flame is someone who you had a romantic relationship with in the past. Last week Alec was seen dining with his old flame Janine Turner in New York. Note: An old meaning of `flame' was the person that someone was in love with.
See also: flame, old
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

an old flame

a former lover. informal
See also: flame, old
Farlex Partner Idioms Dictionary © Farlex 2017

an old ˈflame

(informal) a person you were once in love with; a former boyfriend or girlfriend: My mother has an old flame who sends her a bottle of perfume once a year.
See also: flame, old
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
There once lived, in a sequestered part of the county of Devonshire, one Mr Godfrey Nickleby: a worthy gentleman, who, taking it into his head rather late in life that he must get married, and not being young enough or rich enough to aspire to the hand of a lady of fortune, had wedded an old flame out of mere attachment, who in her turn had taken him for the same reason.
Recently, I was contacted by an old flame and the passion that I had with him was explosive.
[USA], Sep 10 (ANI): Seems like, Leonardo DiCaprio is rekindling an old flame as he recently appeared to be back in the arms of his former girlfriend Toni Garrn.
Not only are there endless unexplained deaths to investigate, but an old flame to contend with.
She receives a phone call from an old flame, record producer Harry Hawkes (Ralph Fiennes), who has arrived unexpectedly on the island.
LAST week Hanssen was trying to bat away an old flame who'd turned up at Holby, tonight it's Serena Campbell's turn when she discovers that her ex husband Edward is the new locum anaesthetist who arrived a couple of weeks ago.
But last night Michelle's anger grew after it was reported that her ex-fiance had been having phone sex with an old flame behind the actress's back.
With an old flame reappearing for Polly, a blossoming new career for Clare and a long-buried family secret in the mix, sparks are sure to fly.
So we ask experts if it's agood idea to rekindle an old flame
A pensioner is back with an old flame he fell in love with 50 years ago - a car called Emmeline.
An angry osprey who smashed his mate's eggs when she went off with an old flame has fathered a new brood.
Portsmouth goalkeeper David James split up with his South Wales wife Tanya to unsucessfully rekindle his love for an old flame Amanda Salmon.
Bizarrely, his first move is to track down an old flame - Denise Osbourne.
A DEMENTED Irish vicar, a confused matron and an old flame all add to the comedy fun as the Dunchurch Players take to the stage in It Runs In The Family.
In this latest installment Georgia must contend with a family trip to Scotland ("Och-aye land"), her over-large breasts ("nunga-nungas"), and her crushes on her boyfriend ("The Sex God"), an old flame, "Dave the Laugh," and a handsome new French teacher.