What's my ex thinking?

My ex recently changed his Facebook status to "in a relationship" but didn't do anything about it before until I posted stuff about my new relationship. Does he keep tabs on me even tho we're not friends on there? He has been with this girl for about 4 months now since then he has never posted anything about them and he also posted that he's been feeling depressed. He even updated his pic. Just wondering what's that all about?
What's my ex thinking?
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