Your heroine is a therapist. She specializes in helping people feel happy and content with their lives. It was the perfect job for her, she loves to help people and she’s always been genuinely happy. Until he showed up…Now she’s discontent and decidedly unhappy.
Why? What did he do to make her unhappy?
Where/how did they meet?
How does her unhappiness impact her life? Her career?
What happens?