What exactly made you realize you had married the wrong person? Was there one definite event or turning point there was no going back from?

Two of the ex's had women in the house with them when I came home unexpectedly early. I don't react well to that. In both cases I walked right out and got a divorce. In the case of the third ex, I was so unhappy, and so restricted by him that I really didn't have much of a life. When he actually threatened my freedom during an argument, I decided right then and there that I didn't want to live the rest of my life in such misery.