Well, it's a bit odd. He might be keeping tabs on you out of curiosity, but not have the courage or motivation to actually have a proper interaction. Or perhaps he's playing some sort of mind game, but that's less likely.
It could be that he's conflicted. Watching your stories gives him a way to stay connected without having to engage in a full conversation. Maybe he's trying to figure out his feelings or waiting for the right moment to reconnect.