The quote "Don't think about it. Don't think about what could have been. It's too unbearable" from Sophie Kinsella's book "Confessions of a Shopaholic" speaks to the struggles of dealing with regret and missed opportunities. It highlights the importance of letting go of past choices that can weigh heavily on one’s mind. Focusing on the negative aspects of what might have happened can be emotionally draining.

The message encourages readers to embrace the present rather than dwell on the past. By avoiding the temptation to ruminate on what could have been, individuals can free themselves from burdensome thoughts and make space for new experiences and opportunities. This perspective can foster a healthier mindset and lead to a more fulfilling life.