Is he disinterested or just really, really shy?

There's this guy I've been crushing on. Well, I think he's cute. Anyways, he's probably the most shy, introverted person I've ever seen. We added each other on Facebook even though we've never had much of a convo in person. We have tons of interests and values in common. He's always the first person to "view" every story I post on Facebook. Though he only sometimes actually reacts to my posts. He recently started greeting me, saying only a nervous but animated "hi!!!" . Then i try to follow the conversation with a "how are you?" Or something to that effect but he just gets all awkward, clams up, and walks away. It's so weird!! But he stares at me from afar. I have tried to message him on social media and he replies with just one word. It's so odd and I can't read this guy for the life of me. Is he disinterested, or scared to talk to me?
Is he disinterested or just really, really shy?
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