There could be various reasons why a guy might stop talking to his best friend because of a girl and then not make things right after breaking up with her. Some possible reasons include:
Prioritizing the Relationship: The guy may have put his romantic relationship with the girl above his friendship with his best friend. He might have been deeply invested in the romantic relationship and chose to prioritize it over other aspects of his life.
Jealousy or Insecurity: In some cases, the guy may have felt jealous or insecure about his best friend's relationship with the girl. He might have perceived the best friend as a threat to the romantic relationship, leading to a distance being created between them.
Emotional Turmoil: Breakups can be emotionally challenging, and the guy might have needed time to heal and process his feelings after the breakup. During this time, he may have withdrawn from all relationships, including his friendship.
Hurt or Betrayal: It's possible that something happened during the course of the romantic relationship that caused hurt or betrayal between the guy and his best friend. This could have led to a breakdown in communication and an inability to reconcile after the breakup.
Pride or Stubbornness: Sometimes, individuals can be prideful or stubborn, making it difficult for them to initiate reconciliation or admit their mistakes. They might let the friendship fade away rather than reaching out to make things right.
External Influences: Other external factors, such as family pressure, peer influence, or changes in social circles, could have played a role in the breakdown of the friendship.
Communication Issues: If the guy and his best friend had poor communication or unresolved conflicts before the romantic relationship, those issues might have resurfaced during the breakup, making reconciliation difficult.
It's important to remember that every situation is unique, and there could be a combination of factors at play. If you find yourself in a similar situation, open and honest communication is essential to understanding what happened and potentially rebuilding the friendship. However, it's also important to respect someone's boundaries and decisions, even if you may not fully understand them. Sometimes, friendships do evolve or end as people grow and change, and it's crucial to allow space for that growth.