I agree, however sometimes we cant dont know what it was.
As a couple DH and I had another couple we were good friends with, a workmate of DH, we had been to each others hens/stag nights and weddings, baby showers, theirs kids birthday parties etc.
Then we just got ghosted, like turn the other way at the mall to walk away from us. And we have absolutely no idea why, we did try calling messaging to ask and got no response. In my view there is nothing that has happened to cause this, I am sure in her view there was, but not kidding, we have given so much thought to it and there isnt even something small we can think of let alone something big enough for them to act like this. And it hurt for sure, mostly because of the lack of closure. Now I am at a place where I think actually it's on them, if I cant work it out they must have their panties in a twist over something small and if they want to throw a good friendship away over it maybe we weren't as good friends as we thought.