But after his previous encounter with Snape, where he offered Snape advice while not knowing what the advice was about, he seemed to accept that discretion can sometimes be the better part of valor, and maybe sometimes you should just shut up.

He didn't need to be sharing these facts with Snape, he even recognized in the moment the undesirability of doing so, and yet he spilled the beans regardless. That boy just aint never gonna learn.