Why has someone disappeared from my Friends & Family list?
Updated
This could be due to one of the following:
They have chosen to remove you from their Friends & Family list.
Following the changes to Friends& Family, they had more than 18 Friends & Family on their list and did not reduce this number before the deadline of 1st September and therefore have automatically been unliked from all of their Friends & Family to give them flexibility to add up to 18 Friends & Family throughout the season.