Is it just the big bright red parts on his face that tell you it is a boy?
That chickens' saddle feathers are longer and pointy, and his comb and wattles are much more defined than I've ever seen on a pullet at 14 weeks old. Definite rooster. Posturing seems to be rooster as well; they stand more upright than girls and look lanky/gangly for longer; he's a pretty boy though, hope you can keep him!