1

If he has a google account too and I sync my contacts to my google account with his phone number then will google notice that we are in phone contact and therefore show my email contact to him in his contacts?

That is, does google reveal additional public information for connected people when it makes a connection between two people?

2

Yes, it does, especially if you or the other person uses Google Contacts app

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Details for updating contacts and adding people are based on

I have observed suggestions to add a Gmail address for a contact who corresponds with a different mail address with me.

Another source could be if you both linked Google + profiles

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