Yes, it is possible for someone to no longer have romantic feelings for their ex but still find them attractive when seeing them again in real life after a breakup. Attraction and romantic feelings are two separate aspects of human emotions.
When a relationship ends, people can go through a process of emotional detachment and healing, which may lead to the fading of romantic feelings. They might come to accept that the relationship wasn't working and have moved on emotionally.
However, physical attraction is often based on aesthetics and can persist even if the emotional connection has waned. Finding someone attractive doesn't necessarily mean that someone wants to be in a romantic relationship with them again. It might simply be an acknowledgment of the person's physical appearance.
Furthermore, there are various reasons why someone might find their ex attractive even after a breakup. It could be due to shared memories, familiarity, positive past experiences, or simply the fact that they were attracted to that person initially.
People are complex beings, and their emotions and attractions can be multifaceted. While some individuals might lose all feelings for their ex after a breakup, others might experience a mix of emotions, including finding them attractive in a physical sense without desiring to rekindle the relationship.