<p>After an intimate relationship ends, individuals commonly experience a longing for ex-partners to fulfill attachment-related functions (desired attachment), although their desires often remain unfulfilled. Previous studies have shown that desired attachment is associated with slower emotional adjustment after breakups; however, it remains unclear how individuals no longer use ex-partners as figures of attachment-related functions over time. Based on data from 54 emerging adults (<i>M</i>_<i>age</i> = 20.91, 68.5% women) who had recently undergone relationship dissolution, the current study used a daily diary design to assess the trajectories of desired attachment (desired proximity, safe haven, and secure base) and their relationship with breakup initiation, attachment anxiety and daily ex-relationship-related thoughts and emotions. Results revealed that attachment-related functions follow distinct post-breakup trajectories. Breakup initiators experienced lower initial levels of desired attachment than non-initiators. Daily experiences, specifically positive thoughts and negative emotions, were positively associated with daily desired attachment. These findings highlight the dynamics of desired attachment after the dissolution of intimate relationships in the context of daily experiences, particularly the importance of daily thoughts and emotions. Future studies should explore the underlying mechanisms and develop effective strategies to improve post-breakup well-being in emerging adults.</p>