I was one of the mistresses who 'won' the man, but it was a hollow victory. I didn't know he was married, well I did but thought he was separated, he lived with his parents and took me back to their house, introduced me to his brother and sister in law, his friends, his colleagues - we stayed over at his parents house every weekend. He had initially told me he was divorced until we had sex for the first time - he was still inside me when he admitted he was not divorced but was separated. I was a 17 year old virgin. I am still angry about that. He was found out when his wife found the floppy disk he used to save the love letters he wrote to me, when she was looking for the disk with her CV. I still don't know why his family and friends played along with his deception for so long - it was six months before she found out.
Anyway he then told me his wife had cancer and that is why he wasn't divorced, but had decided he couldn't be without me so he left her and we rented a place together. I am fairly sure he was faithful to me for the first year, because he was controlling and wouldn't let me out of his sight. He hated me even getting public transport to work. He was violent, financially abusive, sexually abusive, emotionally abusive. By the time I found out he was cheating on me with a girl I had gone to school with (another inexperienced virgin) he had forced me to have an abortion, broken my arm and nose, raped me several times, locked me out of our flat with just underwear on (we lived on a main road) and isolated me from everyone i cared about including my family. He then for the next few months would let himself into the house periodically to rape me, threatening to kill my new boyfriend if I reported him. The landlord wouldn't let me change the locks so I moved in with the new boyfriend (luckily he was the best, and I married him).
I tell you this because the type of man who will gladly lie to someone he professes to love, for that length of time, is clearly someone without redeeming features. He said he loved you, and no doubt said the same to his wife. You are the one who got the best deal by being free of him, because you never know if a bad man is a truly bad man until it's too late.