If his girl is smoking hot and drains his balls on the reg then his MO with her is not really an issue. That is to say, if he's punching at-or-above his weight then there's no reason to harsh his buzz.
If he's playing cutesy just to get starfish sex once a fortnight from little miss piggy then that's a whole other thing.
In that case you would be wise to tell him "I dunno... I just think a guy like you could be doing a lot better... There are girls out there that will treat you like you're Conan the fucking Barbarian if you play your cards right. Just a thought..."
Of course, you gotta be able to practice what you preach. If you're not demonstrating that you're capable of pulling a train of fine bitches then he's not exactly going to jump ship on miss piggy in a hurry.
If he's playing cutesy just to get starfish sex once a fortnight from little miss piggy then that's a whole other thing.
In that case you would be wise to tell him "I dunno... I just think a guy like you could be doing a lot better... There are girls out there that will treat you like you're Conan the fucking Barbarian if you play your cards right. Just a thought..."
Of course, you gotta be able to practice what you preach. If you're not demonstrating that you're capable of pulling a train of fine bitches then he's not exactly going to jump ship on miss piggy in a hurry.
The public will judge a man by what he lifts, but those close to him will judge him by what he carries.