Bruno Mars has said that “When I Was Your Man” came from a very real fear of losing his then‑girlfriend, model Jessica Caban, and from past heartbreak where he felt he had let a good relationship slip away.

Who the song is about

  • The song was inspired by a period when Mars was worried his relationship with Jessica Caban might end, which pushed him into a vulnerable, confessional writing space.
  • At the same time, he and his collaborators describe it more broadly as being about a “pre‑fame heartbreak” and a girl he let get away, so it plays as a composite of real experiences rather than a name‑and‑shame about one specific ex.

What Mars has said

  • Mars called it one of the most honest and nervous songs he has ever recorded, saying he felt “naked and vulnerable” singing it because the subject matter was drawn directly from his real life.
  • His co‑writer Philip Lawrence explained they wanted a stripped‑down piano ballad in the spirit of Billy Joel or Elton John, so the focus stayed on that raw confession of regret toward the woman he’d lost.

How fans and forums interpret it

  • Many fans online repeat the Jessica Caban connection, since timelines of their relationship line up with Mars talking about being scared of losing his girlfriend while working on the album “Unorthodox Jukebox.”
  • Others treat it as a universal breakup story—about “the one that got away”—since Mars has never officially confirmed the song as being only about a single person by name.

In short, the safest answer is: it was written out of Bruno Mars’ real fear of losing Jessica Caban and earlier heartbreaks, but it is not publicly tied to one named ex.

TL;DR: “When I Was Your Man” is about Bruno Mars’ own regrets over how he treated a past love, strongly linked to his fears of losing Jessica Caban, but framed as a broader “lost love” ballad rather than a confirmed call‑out of one specific person.

Information gathered from public forums or data available on the internet and portrayed here.