Open Instagram and go to your profile
Tap your followers list
Search for the person’s username
If their name is not in your followers list, they unfollowed you
Check their profile and see if your account still appears in their following list
Compare your follower count over time to notice changes
Use Instagram’s “Following” and “Followers” lists to manually compare accounts
Check if you can still see their posts, stories, or profile normally
If you suspect a specific person, search their username from your account
Use a trusted third-party follower tracking app only if you understand the privacy and security risks