The cue evokes the scores of previous episodes to represent the Doctor's "past love".

Wondering if your honey's heart remains in the hands of a past love?

Frequent emails, phone calls, or online messaging with a past love can take away from a relationship.

As the bridge begins, Dara wishes on a candle that her past love would come back.

She's certain that if she reminds him of their past love for one another, he'll come to her rescue.

He responds by kissing it, until eventually being sucked into the art work after seeing a reflection of breaking up with a past love.

Jack also goes through a period of mourning his past love.

My past love had heard those words from me a million times, over a million meals.

"You only love me when we're eating," my past love used to say.

Encountering the flower in a field, the narrator is reminded of a past love, now dead.