1)Some one that you've been friends with for a long time, even though out the changes this person sticks by you. Even thoughout the changes they'll be there for a long time. So bassicaly, you have been frinds with this person for a long time.
2) Someone that you used to be bestfriend.Too many bad things have happened in the relationship. This could be from too manny lies, or deliberatley trying to ruin the friendship. You you don't really talk to them as often as you used to. Sometimes you don't class them as friends. Just starngers with memories.
Person one: I hate her/Him
Old best friend: Sorry what did you just say, you must be mistaken.
Parent: didn't you guy used to be so close?
Old Best friend: we used to be, just strangers with memories now.