What does it mean when a man leans towards you, right after you leaned towards him first?

We were having a work lunch in a busy place and this colleague of mine was sitting across the table. At some point he started explaining something to me so I leaned towards him, to better hear him. As soon as I did that, he did the exact same thing, leaning towards me while he was still talking.. How can I interpret this behavior?

What does it mean when a man leans towards you, right after you leaned towards him first?
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