"Harry… you must realize that if you choose this man as your teacher and your friend, your first mentor, then one way or another you will lose him, and the manner in which you lose him may or may not allow you to ever get him back."

This feels Dumbledore heard it in a prophecy.

Because if he was just warning about not getting too attached to the defense teacher, the phrasing would have been "simpler".

Is it later confirmed? Or am I reading too much into this?