The speaker describes recovering from a painful breakup. At first, they feel frightened and believe they cannot live without their partner. With time, they think about how they were treated, become stronger, and learn to manage alone. When the former partner unexpectedly returns, the speaker refuses to take them back. The repeated declaration of survival turns private recovery into a confident statement of independence.
Several images make the change vivid. A โbroken heartโ suggests deep emotional pain, while โmend the piecesโ compares healing to repairing something damaged. Being โchained upโ implies feeling trapped by love or dependence; the speaker now says they are no longer that person. โHold my head up highโ is an idiom for feeling proud and self-respecting. The lock and key are practical details, but they also suggest the speaker regrets leaving the door open to an unwanted return.
The song sounds triumphant, but it does not claim that recovery was easy or that painful feelings vanished immediately: the speaker remembers crying and needing strength not to fall apart. โAs long as I know how to loveโ may mean that the ability to give love helps them keep going, not that they need a partner to survive. The lyrics focus on setting a boundary with this particular ex, while leaving open whether the speaker is ready for a new relationship.