While appearing on ABC's Anh’s Brush With Fame on a July 5 episode, Johnson revealed experiencing Lainie's death was his life's "biggest sadness".
"The love of my life hanged herself," the Logie-winning actor told host Anh Do. "And, I'm still very upset for her and for her family."
Johnson's former lover committed suicide hours after the actor ended their relationship in early 2006.
He continued: 'I'd definitely say it's probably my life's biggest sadness. And in a way, the more time goes by, the more it hurts.
"You know how they reckon that you come to terms with your grief as you go along? Not with this one," he tearfully admitted.
"With every year it gets more profound. My sadness grows."
Johnson also lost his mother to suicide when he was a toddler.
If you or someone you know needs help, contact Lifeline Australia on 13 11 14 or visit the website at lifeline.org.au. If it’s an emergency, call 000.
This article originally appeared on WHO.
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