The current relationship answer comes first
These questions separate present relationship state from a historical unfollow claim.
Follow-back questions
Who is not following me back?
Usernames in Following but absent from Followers in the supplied export.
Is that the same as “who unfollowed”?
Accuracy depends on the official export contents and the difference between a current snapshot and a historical comparison.
Does the checker remove accounts?
No. It provides a list for manual review and performs no Instagram action.
Do I have to sign in?
No. Use the official export and never enter an Instagram password here.