What term describes a love fixation with an unwilling or unaware target?

The term that describes a love fixation with an unwilling or unaware target is "limerence." It refers to an intense romantic attraction that often involves obsessive thoughts and fantasies about the other person, who may not reciprocate those feelings. This condition can lead to emotional distress for the person experiencing limerence, as they may become deeply infatuated without any mutual acknowledgment or consent.