Betrayed my love, you owe a debt to your conscience. What do the lyrics mean?

This lyric means that I have a conscience debt because I betrayed love.

This is a metaphor, comparing betraying love to bearing a debt of conscience, and expressing the anxiety and guilt of those who betray love.

Lyrics express a kind of painful emotion. Betraying one's love is tantamount to betraying one's true inner feelings and betraying the other's feelings. This kind of behavior will bring harm and pain to both sides, especially to the one who betrays love.