DEAR ABBY: I have been with my husband for 12 years, married for three. I had an affair a little over a year ago that he found out about. He has let me back into the house, but he demeans my character at every opportunity. I don’t fight back because I know I am the cause of his pain. We have a 3-year-old daughter, and I am now six weeks pregnant with his child. I do not want to argue with him, because if I had been a better wife, he would not be so angry. But the hurt I feel ...