Another viewer said: “David didn’t know Adele was Rob. He just knew that the girl he loved had changed into somebody unstable and despicable.
“Someone who would throw a boy’s body down the well and keep it a secret because it was ‘convenient’, and whom he later suspected probably killed him.
“When he wanted to leave the relationship, she blackmailed him into staying. He went from not being in love with her, to hating her.
“Even in real life, sometimes people fall out of love with each other.”
Most have suggested David had sensed a significant change in Adele, but he never found out who she really was.