I am a very sensitive person (someone could say something, and I'll asume it's about me) even though I don't know that for sure

I'll usually tell them in the nicest possible way to get lost, and if they want to talk about it later, then they can feel free to find me and discuss it.

then depending on their explanation depends on how I feel about future contact with that person

I might choose to stay in contact, but always remember what they did/ said so it will never be the same, or just cut contact with them all together

with all that said, if you've been my friend (for longterm), I don't hold anything against that person

I have few friends, an those I do have I keep close

if you're my friend, you're friend until the end

you just gotta work on the friend part first