Four.

Impulsive, self-destructive behaviors.

If you have BPD, you may engage in harmful, sensation-seeking behaviors, especially when you’re upset. You may impulsively spend money you can’t afford, binge eat, drive recklessly, shoplift, engage in risky sex, or overdo it with drugs or alcohol. These risky behaviors may help you feel better in the moment, but they hurt you and those around you over the long-term.

HelpGuide.org

Impulsive and often dangerous behaviors, such as spending sprees, unsafe sex, substance abuse, reckless driving, and binge eating. 

NIMH

Impulsive and risky behavior, such as gambling, reckless driving, unsafe sex, spending sprees, binge eating or drug abuse, or sabotaging success by suddenly quitting a good job or ending a positive relationship.

Mayo Clinic

Impulsive behaviors that can have dangerous outcomes, such as excessive spending, unsafe sex, substance abuse or reckless driving.

NAMI

This is one of nine traits used to diagnose borderline personality disorder. Many are common to other disorders, and you should seek professional guidance (if accessible) if you are concerned about a diagnosis.