Answer:
John and Elizabeth relationship went sour because John was cheating on Elizabeth by dating Abigail
Explanation:
The relationship between John and Elizabeth went sour because John was cheating with Elizabeth by dating Abigail in which Elizabeth later discovered the relationship which makes her to always been in a sad and unhappy mood. Although John later regret his action but it was too late for him.
Elizabeth was finding it hard to forgive and forget about what John did to her which in turn made her not to trust John.
