Boy meets girl. They have a toxic situationship for 18 months. She has a "roster" (multiple people she is dating casually). He develops limerence. She says, "Let’s not define this." He agrees while secretly hating himself. One night, she "breadcrumbs" him (giving small hints of affection to keep him hooked). He explodes in a text message: "I’m not your emotional support animal." They break up. Six months later, she "submarines" (pops up after zero contact like nothing happened). He responds. The cycle repeats.