There's a good chance he has BPD (Borderline Personality Disorder). Poor choices, mood swings, erratic behavior. etc.

Symptoms of Borderline Personality Disorder
Borderline personality disorder symptoms vary from person to person and women are more likely to have this disorder than men. Common symptoms of the disorder include the following:

*Having an unstable or dysfunctional self-image or a distorted sense of self (how one feels about one’s self)
*Feelings of isolation, boredom and emptiness
*Difficulty feeling empathy for others
*A history of unstable relationships that can change drastically from intense love and idealization to intense hate
*A persistent fear of abandonment and rejection, including extreme emotional reactions to real and even perceived abandonment
*Intense, highly changeable moods that can last for several days or for just a few hours
*Strong feelings of anxiety, worry and depression
*Impulsive, risky, self-destructive and dangerous behaviors, including reckless driving, drug or alcohol abuse and having unsafe sex
*Hostility
*Unstable career plans, goals and aspirations

Source:
https://www.psycom.net/depression.ce...orderline.html