Sir Paul Coleridge is a well respected, former family High Court Judge.  His article today in the Daily Mail is heart wrenching and I would urge any separated parent to read it and pay heed to the lessons to be learned.  I frequently say to parents "You must put the needs of your child first, they did not chose their parents, but you chose who to parent with".  At some point in time most couples thought they made a good enough team to bring a child into the world, having made that choice as parents you have to have an on going commitment to your child regardless of the state of your relationship outside parenting.  When parents do this well they work really hard and often make personal sacrifice.