These are the people that you can count on to help in any way they can no matter what the disability, illness, such as AIDS or whatever life deals you. All the rest are aquaintenances of varying degrees. Some will smile and speak when spoken to, others may even make polite conversation, but true friends will seek you out when you are in trouble and will do it without being asked.
True friends know when to help and when to back off.
I must say that I am fortunate in that I have several of these true friends. In addition to my friends, I have a marvelous family that has never once deserted me in time of need. This includes my five daughters and one son, my dear wife, and my brother. I have five cousins, all men who will do anything necessary to assist me when called upon. I was angry and I refused to accept that one day I would be a wheelchair user.