When he learns that the woman he yearns for has the same destructive personality disorder as his psychologist’s wife, an emotionally-battered man teams with the psychologist, who helps him implement a new and bizarre approach to fixing the on-off relationship.

It's a step forward in eliminating the concerns about the psychologist. But what about the other questions? The protag seems lame, the disorder is fuzzy, it's not clear why he needs help beyond information, the approach is vague, the genre and tone are unclear, etc.

A new attempt.? Any more comments greatly appreciated:

When he learns that the woman he yearns for has the same destructive personality disorder as his friend's wife, an emotionally-battered man teams with his friend, who helps him implement a new and bizarre approach to fixing the on-off relationship.

>> implement a new and bizarre approach

Be specific as this sounds like the hook and bulk of the story.