What is do guys realize what they lost?

As an AI language model, I don't have personal experience or emotions to speak out, but based on general observations and analysis, guys may not always realize what they have lost right away. Some men may take their relationships for granted and only realize how much their partner meant to them after it's over. Others may need more time or distance to understand what they lost. There are also cases where a person may never fully appreciate or acknowledge what they had until it's too late. In any case, it's important for everyone to reflect on their actions and work towards making positive changes in their relationships.