I have this friend from high school. We were pretty close back then, but his adult life has always been kind of a train wreck. He joined the army out of high school, got kicked out for drugs, has since been arrested numerous times for shoplifting, assault/battery, DUI, and I'm pretty sure he has warrants out for his arrest. He's pretty much destroyed his relationship with his family due to his addiction and mental illness.

About five years ago, we started hanging out again for the first time in years. Pretty soon, he began calling me all the time, randomly showing up to my house and workplace unannounced, just generally bugging and harassing me. Admittedly, I did ignore a lot of his calls... mainly because they were at random hours when I was busy, and it was always him just demanding that we hang out. So after a week or two of this, I kinda flipped out and told him to fuck off. We spoke one more time, I apologized for being so harsh, but explained that I just didn't have the time or desire to hang out with him that often.

Fast forward to last week. I get a call from a random number. I answer and it's him, we chat for a while just catching up. From the sound of it, he's a full blown alcoholic now. He wanted to hang out, but I told him honestly that all of my time is taken up by the business I started last year. I told him it was nice to catch up, maybe some time when I'm free we can hang out, but it will probably be a while.

Since then he's called me 3 times and I haven't answered. I get the feeling he's gonna start randomly showing up again. I don't know what to tell him. It's not that I hate him or anything, it's just that I have a very busy life and I don't really "hang out" with anyone these days. I guess if I'm being completely honest, he kind of makes me uncomfortable. He's very immature, impulsive, and it just takes a lot of energy to be around him. He clearly needs to get some help, but I don't know how to do that. His family have tried their best to help him over the years, but it never works.

At this point, it feels more like a burden than a friendship. We have nothing in common anymore... I'm a college graduate running my own business, and he's a total mess. I don't mean to sound condescending, it's just that our general mental states and lifestyles are so completely different. I feel bad for him, but I also feel that it's not my responsibility to be his best friend. Am I the asshole here?