In this sequence of poems, the persona addresses the infidelity of his beloved. He manages to always find a way to negate anything negative about their relations through the power of imaginative transformation. By claiming that they are united by the bond of love, the persona of the poems is able to enjoy what would otherwise be torturous. That's the overarching theme that ties all of them together so far: what cannot be won in life can be won in letters.

Important to this rhetorical move is the idea that some love is true and some love is false. Romantic love is common and easily found, but true love is rare and overcomes all obstacles. This laborious undressing of his feelings creates a vulnerable voice. It is easy to feel sympathy or at least to empathize with this forlorn lover. 

The idea of authenticity is central to the value that the persona offers. In order for flattery to be effective, it has to be convincing. Shakespeare writes: "Take all my loves, my love, yea, take them all. What hast thou then more than thou hadst before? No love, my love, that thou mayst true love call; all mine was thine before thou hadst this more." 

The image of the unbothered and generous lover is a positive version of the cuckold. Not only is he not threatened by the rivals, he enjoys seeing his beloved receiving affection from his own former lovers. Is the persona a cuck? Absolutely, but this is maybe the best case for cuckoldry ever. Instead of reacting with negative emotion to his beloved's promiscuous sexual nature, he enjoys it.