Should I move on?

I have a bit of a hard decision to make that involves my closest friend.My friend has not been the most responsible person in the world. However, the past few years he seems to have been going through a bad patch. Diagnosed with diabetes, evicted from two different apartments, fired from a job after 12 years and will not tell me why. And to top it all off he has managed to be estranged from his sister, his only family in NJ. One would think that after being diagnosed with diabetes and changing his health habit managed to get it under control that he didn't need the medication anymore. However, he did not take care of himself as one would think and he had a diabetic attack that put him the hospital. He got out of the hospital and you would think that would be enough to scare someone straight and keep it under control. This unforutnately was not the case and he stopped taking the diabetes medication. And then one day, he collapsed near his home, his sister found him and got him to the hospital. However, this time his kidneys failed and he is now on dialysis several times a week. Then some time after that he was evicted from his second apartment as the owner wanted him out and didn't want to hear it anymore. Apparently he had money issues.....again. As I stated he is very irresponsible at times. He found another place and almost got evicted from that one due to financial issues and although I was advised not to, I helped him out financially to keep him from being homeless. During this time I've been watching his appearance degrade, I even made mention of it but it fell on deaf ears. And being estranged from his sister means she will not help him in anyway. Although he has been my friend for a very long time, I have been contemplating walking away as I don't feel this is good for me to be exposed to his situation. And, this past weekend when I saw him he could barely walk and just was not himself and was totally unkempt. I repeatedly asked if he was ok, he just said he had this taste in his mouth he couldn't get rid of, so i essentially got nowhere. I am at the point that if its time for me to just move on...

What do you all think?

thanks