Direct answer: “How Could an Angel Break My Heart” is a Toni Braxton song from her 1996 album Secrets. The lyrics describe heartbreak after discovering a lover has moved on with someone else, using the metaphor of an angel breaking a heart to convey the sense of betrayal and sorrow. Notes on the song and lyrics (context and themes):

• Theme: heartbreak and betrayal in a romantic relationship, expressed through imagery of angels and lullabies.
• Key lines: the refrain questions how an angel could break a heart and reflects on a lost love and the pain of a falling star left unrewarded.
• Mood: emotive, soulful ballad with a blend of vulnerability and strength typical of Toni Braxton’s style.

If you’d like, I can provide a short excerpt that’s appropriate to share or offer a brief analysis of the song’s structure, verse progression, and melodic cues.