A bipolar divorcee blackmails a self-absorbed family man to keep their affair alive and reignite her sex drive when he suddenly disowns her.

Just one suggestion: "after he disowns her," not "when."

Your logline needs that one extra thing.

At the moment it reads a lot like Fatal attraction. Maybe the married man could be the President of the united states. Maybe the lead character is a teacher having an affair with her student when he begins dating someone else; then she goes crazy.

Once you find your hook, something to make it stand out, the logline will flow much better.

Agree with Nir Shelter. ?Just because she's bipolar doesn't automatically confer sympathy. ?It might explain her behavior -- although I think borderline personality disorder might be a better descriptor for her behavior-- but it doesn't justify it.

More importantly, ?the ?mentally disordered woman has to measure up to ?Alex in "Fatal Attraction". ? And the stakes have to be as high as in that movie -- not merely embarrassment and shame over being outed -- but a matter of life or death. ?And in that film, the husband is the protagonist. Alex, the one-night stand who turns into a nightmare, is his nemesis.