The speaker will testify against himself, constructing a narrative of his own faults to justify the beloved's rejection and prove the beloved's virtue.
The speaker weaponizes his own weakness, compiling a confession of faults to justify the beloved's rejection. This is perverse loyalty: by destroying his own reputation preemptively, he ensures the beloved looks noble in leaving him. The paradox is profound—by annihilating himself, he proves his love's authenticity. Self-betrayal becomes the final proof of devotion. The sonnet presents masochism as the ultimate expression of sincerity, inverting traditional logic of self-preservation.
The speaker claims he gains even by being destroyed: 'I by this will be a gainer too.' The gain is existential—he demonstrates that his love transcends self-interest or survival. By voluntarily bearing all wrong on behalf of the beloved, he achieves a kind of spiritual victory. This sonnet articulates the martyr's psychology, where loss becomes proof of ultimate possession (of noble feeling, of authentic love, of moral superiority through self-immolation).
When your partner wants to leave, you help them by curating evidence of your own failures—editing your diary to show your worst moments, confessing mistakes you might've hidden. You become the prosecutor of yourself, not to win them back but to earn the dignity of having loved truly through total sacrifice.