Dear Abby advises a person who is thinking about separating themselves from their friend who is dealing with mental issues. nenetus - stock.adobe.com DEAR ABBY : I have a friend I have known for a very long time. We bonded 10 years ago over common interests and mutual friends. Over the years, they have suffered from anxiety, depression, and OCD. In addition, they are also narcissistic, but it has never been a problem before.  I have spent many a day and night on the phone with them for hours, letting them talk out their problems. I have always been supportive and empathetic, offering help or suggestions. Abby, they can’t hold down a job! They invariably quit for some reason or another, and they have a drinking problem as well.  It is becoming increasingly difficult to remain friends. After years of being the supportive friend, it seems that’s all I am. Whenever this friend wants to contact, the entire time is spent talking about them.…