what is the worst thing you have ever done?

In my friends' life has been devastated due to addictness towards drinks. Eventhough he was of lesser calcium and basic cancer symptoms he has exhausted all the wealth and property of his parents by his compulsions . At present his family is expecting his sons' future towards wealth. His son i presently undergoing under graduate course. Really horrible life for my friends' wife to lead. The thing i have done in my life is spent of for my co sisters' marriage with my brother in law the marriage was perfect. My relatives compelled to withdraw from arranging marriage but i insisted is the worst thing in my life.