Holds eye contact but never talks?

There's a guy at office that always holds eye contact whenever we happen to cross the hallway until I feel awkward and have to tear my eyes away. But he doesn't really try talking. I'm the only one initiating conversation if we're working in the same workspace but it ends within seconds and he only responds to my questions. What's going on? He's 30. I'm 26.
Holds eye contact but never talks?
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