During the height of limerence, thoughts of the limerent object (or person) are at once persistent, involuntary and intrusive. Such 'intrusive thoughts about the LO ... appear to be genetically driven'[13]: indeed, limerence is first and foremost a condition of cognitive obsession. All events, associations, stimuli, and experiences return thoughts to the limerent object with unnerving consistency, while conversely the constant thoughts about the limerent object define all other experiences. If a certain thought has no previous connection with the limerent object, immediately one is made. Limerent fantasy is unsatisfactory unless rooted in reality,[11] because the fantasizer may want the fantasy to seem realistic and somewhat possible. At their most severe, intrusive limerent thoughts can occupy an individual's waking hours completely, resulting—like severe addiction—in significant or complete disruption of the limerent's normal interests and activities, including work and family. For serial limerents, this can result in debilitating, lifelong underachievement in school, work, and family life. Comparisons made between limerence and substance addiction may draw attention to the constant, free availability of the limerent's "drug of choice," as they are essentially suffering from a chemical imbalance within the brain.

Fantasies that are concerned with far-fetched ideas are usually dropped by the fantasizer.[11] Sometimes fantasizing is retrospective: actual events are replayed from memory with great vividness.

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I keep playing one of the four days over and over and over with absolute amazing clarity...wishing I could go back.