I am with Ladybirder here
...Helen could have taken a route out of this farce anytime in the last 2 years but failed to see the sensible path to take.
On Sunday evening she should have just popped Henry and an overnight bag into her car, or Kirsty's, and fled, at high speed. Even at the very end, she didn't want to take the obvious choice of going home to her parents, thinking that sofa-surfing at Kirsty's was the right thing to do !
Instead, and inexplicably, she decided to give Rob a Last Meal meal of Tuna Bake ( which she thought he didn't like ! ) and then leave home, after some frightfully middle-class Last Supper, a meal with someone she knew to be a psychopath and a monster.
Whatever sympathy I might have had of Helen is fast dissolving.