A similar experience with me. Friend of more than twenty years, we shared everything, personal things, secrets etc. She moved moved back from London and that's when our friendship ended all of a sudden.
We had developed different lives over the years which we didn't seem to realise when we lived so far apart. When she returned, she expected to pick up where we left off, but I didn't want to revisit those times. We had fun, we were very close, but we had changed as individuals.
Following some unpleasant exchanges, I decided that we could no longer go on, and took several paces back. It was upsetting to lose a dear friend, but our time had come to an end.
Perhaps just take some time out and see what happens.