It represents a physical and metaphysical end to his reproductive phase, she has used it and she's making sure no other women can use it. There's a component of female intrasexual competition to the vasectomy. This is also why some men report their wife's libido dropping to absolute 0 after their vasectomy. She thinks she wants him declared sterile and of no use to any other women. However after this happens it turns out a large part of her attraction to him was the idea that other women might desire him for reproduction. Now that he's sterile the danger is gone, the feelings are gone, her libido is also sterilized.

https://x.com/ChadSpecialist/status/2073073874409787783

(https://autoadmit.com/thread.php?thread_id=5879608&forum_id=2#49978494)