'Friends' star Lisa Kudrow breaks silence on Matthew Perry

Matthew Perry left this world on Saturday after being found unresponsive in L.A home. He had a troubled life, especially his unchecked addiction, which he kept under wraps for quite long. 

It was so secretive that his Friends co-star Lisa Kudrow doesn't know, which she admitted in his Friends, Lovers, and the Big Terrible foreword.

Looking back at her relationship with the on-screen Chandler Bing, the 60-year-old admitted about the late actor's addition that she doesn't precisely know what his condition was.

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"I wasn't exactly sure how Matthew was doing. As he'll tell you in this book, he was keeping it a secret. And it took some time for him to feel comfortable enough to tell us some of what he was going through."

She continued, "Over those years I didn't really try to intervene or confront him, because the little I knew about addiction was that his sobriety was out of my hands."

Noting, "And yet, I would have periods of wondering if I was wrong for not doing more, doing something. But I did come to understand that this disease relentlessly fed itself and was determined to keep going."