lichess should show the names who unfollows us

Make a list of followers you which to control the number of, by saving it to text file (on cloud , pastebin type, specially if handicapped by small screen device with little file management permission for the user, or to local desktop from browser).

Subtract. (maybe some alphabetical order would help, or some spreadsheet).

But if about some disagreement, best is not to use following as a mean of communication.

I don't use alphabetical order on my pastebin, I just list them chronologically (according to the original list on Lichess), also I write them in blocks of five, so I don't have to compare ALL names one-by-one, instead I just traverse blocks of 5 to see in which block there's a name missing