Hey you did the right thing! That buck is still out there, and he's only going to get bigger. If he went threw your area once, he'll make his rounds again. You shouldnt be kicking yourself at all, you should be patting yourself on the back, for having your stand in the right spot to see such a nice buck. Then hopefully next year youll be thanking yourself you passed him up..
"If I pull the hammer and shoot this young buck, he's dead. But if I pass on him, the next hunter might not shoot so straight."