What is one thing you have done that you will regret for the rest of your life?

On new years day 1990 i jumped off the local highway bridge that goes over our river. Had been doing it since i was a kid. But this time i brought my friend from out of town. I knew he could swim well but what i didn't know is that he could't handle the cold water, and when we both hit the water he couldn't cope withe it and froze up and even though there were about 50 people on the bank watching. I tried to save him but he kept trying to climb up me and was pushing me under. He had a vice-like grip of my arm and was screaming don't let me go. But i hate myself for this even now, but i had to force his hand off my arm while he was screaming at me no no please don't let me go.. or i would have drowned too. There was a moment where i was going to go down with him, but for some reason I swam to the bank yelling for help but nobody helped. I tried to grab a ball to throw to him but the people playing with it wouldn't let me. I watched him float behind some trees and that was the end. I have to drive across the same bridge every day to work. It haunts me.