For ever, Fortune
Personified Fortune
Fortune addressed directly as an active enemy who deliberately interferes. Not random bad luck—an intentional saboteur of love matches.
Soul-wasting time
The repetition of 'wish' captures futile longing—not active hoping but passive deterioration. Youth consumed by waiting.
Loveless marriages
Fortune arranges marriages without love—'joyless vow' suggests arranged or mercenary matches common in 18th-century society.
Bargaining stakes
The final turn: he'll stop complaining about Fortune entirely if he gets this one thing. Total renunciation for one granted wish.