We both said we would never get a second dog, but after having Roxi 8 or 9 months we BOTH started to see that SHE needed a companion... And when I brought it up my b/f was all for it. HE was the one who did all the legwork to find Rocco!! I would just put it to him that a new puppy would be for your current dog, for companionship, not just for you!!
Good luck!!