The "That '70s Show" star was also at Lovato's side when she was first hospitalized for a suspected opiate overdose, reportedly visiting her for hours at a time at Cedars-Sinai Medical Center in Los Angeles.
She credited the fact that Lovato did make it to the work of everyone at the hospital, as well as "the millions of prayers that went up that day" from fans and well-wishers.
He admitted to providing Demi with prescription drugs, but at the same time, he said that they were not pharmaceutical.
"And she stopped for a second, and she said: 'She's conscious but she's not talking.' And so I knew that we that we were in trouble". And someone said, 'I just saw (the news) on TMZ.More news: Emilia Clarke got the most flawless Game of Thrones tattoo
In her 2017 documentary "Demi Lovato: Simply Complicated", Lovato confessed that she wasn't sure she'd ever get over the actor, who she called the love of her life. I didn't know what I was looking at.
"It's only when I'm lonely/ Sometimes I just wanna cave/ And I don't wanna fight". I think my heart is always with Wilmer, I think it was with Wilmer, I think it is with Wilmer, I think it will be. "She's happy, she's healthy", said De La Garza.
Watch the full interview with Dianna de la Garza below.More news: Will one of Apple's new iPhones be your next smartphone?
Demi Lovato's mum says the singer is "doing really well". "Right now, Wilmer is just trying to be there for Demi and be a solid friend to her".
De La Garza added that "She's working on her sobriety and she's getting the help she needs, and that in itself encourages me about her future and about the future of our family".
What followed were dark days, with Lovato in critical condition, her mother said.More news: Yes, the FBI Actually Has Investigated Allegations Like Christine Blasey Ford’s Before