Once a friend to me....... always a friend. No matter, if we don't talk for 40 years, I just pick up where we left off. I seem to have lost all adherence and awareness, for time and that some people need more contact. People come in and out of my life, I don't mind if they are not around all the time.
However, if you were once a friend to me and we had a falling out (hey, it happens), or Door Slam Party, then end of story. Sleep with the fishes. Boundaries and steel reinforced stone cold walls, are a Martha Stewart *good thing*.
I'm probably a "difficult" friend, as the other person (or friend), usually, does most, if not all, the contacting and keeping in touch.
Acquaintances? I'm having a hard time thinking of just one, as my "circle" of Humans, is so small. You are either in or out, with me. I guess the person at the grocery store that checks me out at the register is an acquaintance?
What freaks me out is when someone uses my first name, and I have NO IDEA who they are. Wow -- how do you know me, but I don't know you! Tin foil hat time! Who told you may name, I surely didn't. CREE--heeeee-heeeee-PY!