Matt Willis was worried Emma Willis would leave him "many, many times" during his addiction battle.
Emma Willis has stood by her husband Matt
The 40-year-old musician - who married the 'Voice' host in 2008 - has credited the mother of his three children with helping him survive his issues with substance abuse.
Speaking in upcoming BBC documentary 'Matt Willis: Fighting Addiction', he said: "I thought she would leave me many, many times, and I was involved in some of those times when people were saying that.
“I’m so grateful she didn’t and that she could see something in our relationship that was worth holding on to. And it was — we have three kids and we’re very happy.
“It’s always hard to hear other people telling your wife to get out, but understandably at the time."
The Busted singer, who is an alcoholic, got sober before they got married but then turned to cocaine when the 'Year 3000' band reunited in 2016 after splitting in 2005.
He admitted he doesn't like to think where he would be without the 47-year-old star's support.
He added: "I dread to imagine where I'd be without her. I'm so grateful and thankful for her in so many ways.
"A lot of people don't have someone like that, and especially not someone that's going to stick around when you put them through hell."
Despite seeing her husband - who has been to rehab a number of times - struggle over the years, Emma admitted she was determined to stand by him.
She said: “It’s very easy to look in on a situation you’re not directly involved in and go, ‘F*** that, get out now’.
“But when you’re in it and you have that history together and you love someone so dearly, you’re not going anywhere.”
'Matt Willis: Fighting Addiction' airs on BBC One at 9pm on May 17.
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