DEAR ABBY: I’ve always been a self-sufficient woman. I grew up in an abusive household, moved out at 16, and cut off contact with my family a couple of years later when it became apparent nothing would change. Nine months ago, my husband walked out on me and our 3-year-old son. He has no interest in our child. Our roommate, “Matt,” became “Daddy” to my son with my ex’s blessing. I want a divorce, but I’m not sure how to proceed. My ex and I have talked; he wants to give up his parental rights, and I have no interest in getting ...