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That's one of the reasons why you're not over him , because you are following what's he's doing on social media. To get over someone you need to remove all traces of them from your life.
It's difficult to say if they like each other or just liking each other's pics. There's a huge difference between the two.
If you aren't together now , then his loyalties no longer lie with you , so it's best to try to move on from him, or you'll be the one who ends up hurt.