"If I can't have them, no one can" is the motto of yandere archetype characters. The yandere is a dere type that combines "yanderu," meaning sick, and "dere," meaning lovey-dovey. Together, it creates someone so lovesick that they're willing to do absolutely anything to end up with the one they love.
Source：https://www.cbr.com/best-yandere-characters-in-anime-ranked/
