*Paints Target on Chest*
Been there, done that, got the T-shirt, wife, step-kid, three additional kids, and a sixth anniversary this month. She was married when I met her, and I knew it. She told me he had an alcohol problem, was an emotionally abusive man, and was starting to become physically abusive, after only one year of marriage. I was able to verify independently that he did have an alcohol problem, and seven years later, he is being emotionally abusive to his new wife, and is starting to become physically abusive with her, as witnessed by my step-daughter every other weekend.
I am glad my wife and step daughter were able to get out of that situation. They have a much better life now than they would have had they stayed there.
Should you do it? That's up to you. I'm not telling you it was easy, or even morally right, but in the end it was the best for all. It can work out.