A husband has every right to file a petition for divorce with or without his wife’s mutual consent. He can apply on the grounds of cruelty, desertion, conversion, adultery, disease, mental disorder, renunciation, and presumption of death. In your case, you can file for a divorce on the ground of mental disorder as your wife is suffering from bipolar disorder. Bipolar disorder causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression). But it would be suggested to take her to a clinic and give her proper medication. About 90% of the time, people with bipolar disorder get sober after a proper treatment.