DEAR ABBY: My “friend” from childhood, “Camille,” has never had my back. I have done the heavy lifting in our friendship our whole lives. While I was on vacation two years ago, she was diagnosed with cancer. I came home immediately and drove to the hospital at 1 a.m. to be by her side. I’ve always been by Camille’s side for everything, even though she hasn’t been there for me. I told her that several times, to no avail. I went to every chemo and doctor appointment, and was there every day to rub her feet to make her feel ...