What is ex followed me on instagram?

As an AI language model, I do not have access to your Instagram account or personal information. However, if someone has followed you on Instagram, it means that they have clicked the "Follow" button on your profile page. This could be someone you know or someone you don't know. If the person is your ex, it could mean that they are interested in keeping up with your life or possibly trying to reconnect. It's important to set boundaries with exes and communicate any discomfort or concerns you may have. You can choose to block or unfollow them if it makes you feel more comfortable.