It could mean he's still curious about your life. Maybe he has some lingering feelings, but not enough to get back together. It's also possible he just likes to keep tabs on you out of habit.
It depends on how you feel. If you think you can handle it without getting too emotional, you could casually ask him. But if you're still hurting from the break - up, it's probably best not to. Confronting him could reopen old wounds and might not lead to a positive outcome. He may just be watching your stories out of idle curiosity, and bringing it up might make the situation more complicated than it needs to be.
It could mean she still has some curiosity about your life. Maybe she doesn't completely want to cut off all connections with you, even though she ended the relationship. It might also be a habit. She used to be interested in your stories, and it's not easy for her to just stop all at once.
Well, it might be that he dumped you but still wants to see what you're up to. He could be having second thoughts deep down. Or perhaps he just enjoys seeing the snippets of your life without having to be directly involved. It's a bit of a mixed signal, really.
It depends on how you feel. If seeing his name among your viewers makes you uncomfortable or it's preventing you from moving on, then yes, block him. But if you don't really care, you can just leave it as it is.
It's hard to say for sure. Maybe he's conflicted about his feelings for you. On one hand, he might not be ready for a full-on conversation, but on the other, he still wants to keep tabs on what's going on in your life by watching your stories.
Well, he might be conflicted. He blocked you, perhaps because he was angry or wanted to create some distance. But he still watches your stories because he still has some level of interest or attachment. It's like he's not fully ready to let go. He could be secretly hoping things will change between you two in the future.