Should I assume he’s not interested if he doesn’t really say hi first or start a conversation… is he keeping things professional?

When I start the conversation he’s funny and cool but after that nothing else…. He doesn’t really say hi or bye and our rooms are right next to eachother at work.

we got some things in common.. from the same state and went to the same college.

Should I assume he’s not interested if he doesn’t really say hi first or start a conversation… is he keeping things professional?
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