He was flirty but now ignoring me?

So I work in the same company with a guy but we just started working together in November. Before November we had not met. From November until two weeks ago we had not met in person. He was flirty with me initially and was friendly and starring at me when I met him two weeks ago but today he completely ignored me. Could he be feeling overwhelmed and the prospect that of having feelings for me? And should I not talk to him until he makes contact and starts being friendly again? He is in his mid 30s.

He was flirty but now ignoring me?
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