Check your followers list and compare it with a previous list or screenshot
Use Instagram’s search to look up the person’s profile and see whether you still follow each other
Review recent follower changes if you track them manually
Use a third-party follower tracking app only if you trust it and understand the privacy risks
Look for signs such as their profile no longer appearing in your followers list
Check whether their posts or profile are still visible to you, which may indicate they blocked you instead of unfollowing you
Ask a mutual follower if the account is still following you
Keep a regular record of your follower list to make future unfollows easier to spot