I dated a married man years ago. It did me and him no good. I closed my eyes to meeting someone who could have really been the one. I was just something that fed his ego. While his wife was home cleaning his house and taking care of his children, I was the one he was taking out. He never saw me in a bathrobe and taking out the garbage!
Years later, my husband was seduced by a "sparkler". She was dumped by her husband and needed to attract mine to see if she still had it. I knew she had no interest in him and it was purely selfish reasons she broke up my family. He realized that too when he was free and she was no longer interested.
We all make mistakes in life, but using the excuse "I was drunk" or "in love" just doesn't cut it. Sometimes just puting it on paper helps you see the right way to go.