Five years ago I was truly happy. I had it all: a wonderful decade-long relationship, a beautiful son, my own house, a job as a feature writer. Coming from a working-class background and a tough comprehensive school in Southampton I was proud of what I'd achieved. I'd left home at 16 and moved to London in search of a better life. And now I had it. With a bountiful salary I could afford to send my son to a private school in Hampstead, drive a BMW, have fabulous holidays and fill my wardrobe.