“I get obsessed with people who don't want me”

What could be going on

Limerence: Intrusive longing for someone uncertain fits; check how much of your day it takes.

Anxious-preoccupied attachment: Craving closeness with doubt it'll come fits; check whether available people bore you.

Intermittent reinforcement: Occasional attention keeps hope alive; check whether they give small crumbs.

Scarcity: Unavailable people seem more valuable; check whether interest fades once they respond.

Abandonment/instability schema: Chasing the unreachable can re-enact early loss; check family history.

Repetition compulsion: Fits if the pattern recreates an old unrequited bond.

Also said as

• I'm obsessed with someone who's not interested
• I can't stop thinking about my crush
• my friend fixates on guys who ignore her
• the less they care the more I want them
• I chase people who aren't interested
• why do I want people who reject me