Candace Walsh, co-editor of the new anthology Dear John: I Love Jane: Women Write about Leaving Men for Women (Seal Press), comes to understand her true desires and, in the process, discovers her writing voice. Right before I got married to my (now ex-) husband in the spring of 2000, my office’s secretary offered to read my palm. “Okay,” I said. She held my hand in hers, atop the gray Formica of…