Why do we want to know things we don't want to know?

After a break-up, why do we want to know things about our ex even though the more we know, the more it is painful? For example, I'm hiding the news feed from my ex on Facebook because I do not want to see news from her, see pictures of her and her new boy friend. But on the other hand, I didn't delete her from my friends and I'm still clicking on 'Show Hidden Feed' because I still want to know. I know I'm not the only one, and seriously what's up with that? What should we do?
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She broke up with me and I didn't want the break-up so I know that even though I'm moving on, I still like her. I've always known this so I know I am in a fragile state of mind but I think that's always the case when you loved someone.
Why do we want to know things we don't want to know?
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