I wish i new what goes on in peoples minds

A while back i worte a letter to a old friend. Lately we've been talking a bit more often. I noticed he says things directed to me, that i said to him in the letter. Im not sure if its intentional or if its a coincidence. It never seems to be in a mocking way. So either he feels the same way i do, or im misinterpreting his words. Im just wondering if this is somthing that people do without realising it.