Now of course this would be beneficial to HIM. But don't you want good/nice guys to be successful with girls? Or would you rather just not tell him and keep him wondering what it was that you didn't like about him? Then he would probably keep running into failure after failure with every girl he meets because no one will give him the structural criticism he needs to improve himself for future dating prospects.
Most Helpful Girl
If he asks for my opinion, sure.2