advise on, well...

ok.

friend A used to enjoy partying with friend B. (two guys hanging out)

friend B had a problem with his partying, and joined Alcoholics Anonymous which made him stop all types of partying.

Friend A has been supporting him in his program for 2 years.

but lately friend A genuinely thinks friend B is missing out on a lot of life's fun.

question: should friend A tell friend B?