Thanks for sharing your story. Bird nesting can indeed work. So can transforming a marriage into a parenting marriage, a concept my co-author and I introduce in our book "The New I Do: Reshaping Marriage for Skeptics, Realists and Rebels." It can take a few forms, but one that works for unhappy couples is to stay in the family home but remove the sexual/romantic aspect of the parental relationship. Parents do not need to love each other to raise healthy, happy kids; kids just need their parents to love them and to have their parents show kindness and respect to each other (kids never want to know about their parents' sex life anyway). I've written about in many places, including here: https://www.theguardian.com/lifeandstyle/2015/apr/15/forget-conscious-uncoupling-families-platonic-parenting