Well he is mentally still attached to the organization. Me, i will never say that. I'm convinced that knocking on doors and giving talks will not bring you closer to Christ and God...the WTBTS would have you believe that slaving for them is what brings salvation, but once you realize that it doesn't you are becoming free. If your friend is REALLY ready to be a good J-Dub, I think he would need to confess (JC hearing) to the brothers his double life...and see if they can mentor him (brainwash him more) so that he is happy again. They may not even DF him, maybe only Public Reproof or something. (especially if he's not married)
Funny how the Society always talks about doing what your circumstances can allow, and in the same breath tell you that you can do more.