It may be that they're still interested in your life to some extent. They might not be able to completely cut off that connection and seeing your stories gives them a little peek into your world.
It could mean a few things. Maybe they're still curious about your life or they haven't fully moved on. It might also be a habit they haven't broken yet.
There are several possible reasons. One is that they miss you and are looking for any small way to feel close to you again. Another reason could be that they're comparing their current life to the time when you were together. Or perhaps they're just being nosy and have no deeper intentions at all.
Well, it might be that they still have some feelings for you and want to keep tabs on what you're up to. Or it could just be a habit they haven't broken yet. Maybe they're just bored and looking through everyone's stories.
Well, 'ex' is probably your former partner. They might be watching your stories out of curiosity. Maybe they still care about what's going on in your life, or they could be just nosy.