Hi everyone,

I have a close (28m) cousin with diagnosed bipolar disorder, unsure if its 1 or 2. He has been on the decline mentally recently. He’s always had anger issues and difficulty relating to others. He always cuts people off in conversations and doesn’t have the ability to pick up on social cues. He doesn’t allow people to talk in conversations and If you have a difference in his opinion, he immediately gets upset and begins to argue with you. He was emotionally and physically abusive to his last gf who decided to end the relationship around two years ago. He currently lives at home with his parents and is verbally abusive to everyone in the household. He’s dependent on marijuana and refuses to take his risperidone because it says it makes him feel cloudy and unlike himself. He recently got cut off from his longtime best friend for his behavior and still refuses to recognize that he is pushing people away with his own behavior. 
I’m writing this to see the perspective of other people living with this disorder and how I should go about helping someone who doesn’t believe their behavior is an issue?