Yandere as you wish

Yandere is an archetype. Its essence is that of intense, all-consuming love that develops into obsession and mental instability. Typically, at first glance, such people appear sweet, caring, and gentle. But as soon as their relationship is threatened (for example, by jealousy or an attempt to get closer to the object of their affection), their behavior changes dramatically. They begin to exhibit:
Obsession and possessiveness. They strive to completely control the object of their affection, leaving them no personal space.
Jealousy. They can't accept that their loved one might be interested in someone else.
Aggression. They are willing to resort to extreme measures—from surveillance and psychological pressure to physical violence and even murder—to eliminate competitors or keep a loved one.
Moreover, such people often don't realize that their behavior is abnormal. Their actions are driven by desperation and fear of loss, not by a desire to cause harm for its own sake.
Such people can follow the object of their adoration hiding in a secluded place, and can also sometimes take and take away the objects of their adoration.