Jennifer Aniston broke down in an interview months after Friends co-star Matthew Perry’s death as she dove into the nostalgia of working on the beloved sitcom, calling the close-knit cast a “family forever,” RadarOnline.com can reveal. Perry’s unexpected death at the age of 54 last October left fans and Friends stars heartbroken, though the actor had been candid about how his decades-long battle with drug and alcohol addiction had ravaged his body. On Thursday, Aniston, 55, sat down with Quinta Brunson, 34, for the latest episode of Variety’s Actors on Actors series. This series features one-o…