Matthew Perry and Lizzy Caplan reportedly ended their six-year relationship over a year ago and have succeeded in keeping the split under wraps until a report on Friday.

“It happened a year and a half ago. They haven’t been together for a long time,” a source revealed to Us Weekly.

The pair had reportedly been dating since 2006, but was always very private about their romance. In fact, Caplan is so protective of her private life that she did not refute a publication’s claims that she and Perry were in a relationship in a recent interview. When asked about her relationship with Perry in an interview with U.K. Independent, Caplan pretended not to understand the question.

In that same interview, Caplan spoke openly about her experiences dealing with alcoholism, saying, “I am very well versed in that world, not personally, but I know a lot about that world.”

Perry, who started for ten years as Chandler in Friends, has been very open about his struggles with alcoholism and addiction. He most recently participated in an extremely candid interview with People, in which he discussed his three trips to rehab and opened up about his plans to transform his former beach home into a sober living house for men, called Perry House. Perry’s most recent trip to rehab occurred in 2011, right after his ABC sitcom Mr. Sunshine was cancelled, and supposedly around the near-end of his relationship with Caplan. Sources insisted that his return to rehab was not fueled by a relapse.

“I’m making plans to go away for a month to focus on my sobriety and to continue my life in recovery. Please enjoy making fun of me on the World Wide Web,” Perry had said in a statement.

Caplan is currently staring on Showtime’s Masters of Sex and Perry was most recently seen staring in the cancelled sitcom Go On and guest staring in The Good Wife.

Olivia Truffaut-Wong

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More on Matthew Perry and Lizzy Caplan:

Matthew Perry Opens Up About His Alcohol & Drug Addictions

‘Go On’ Canceled After Just One Season

'Masters of Sex' Series Premiere Recap: Dr. Masters Hires Ginny Johnson; Begins Sex Study

Lizzy Caplan Talks 'Masters Of Sex,' Nudity, Threesomes