I’m writing to get some advice from you all. I am currently a senior in college and I have 2 other roommates, a 21 year old male and his 19 year old girlfriend. I have known both of them for about 6 years now. He has recently seen a major drop off in all interests such as completely blocking his friend group of 10+ years on all forms of communication, dropped out of college with a semester to go, lost interests in all his favorite sporting events, and has been fired from 3 jobs in the last 2 months. All of this happened out of the blue, with no clear traumatic trigger. He is extremely unwilling to talk about any issues he’s facing to a professional, friends, or his girlfriend. He has also started drinking in excess everyday, something that he hardly used to do before the “switch” flipped in his brain. I am worried he is heading down a dangerous path and would I would never forgive myself if I lost him. 

If I had to diagnose him now, I would say he has anxiety, severe depression and a form of Bi-polar. 

Is there any advice you would give to me on how to approach this situation?

Thanks