The 26-year-old "This is Me" hitmaker praised his ex-girlfriend, Lovato, for her bold and modest nature and also talked about her battles with addictions and an eating disorder, reported Female First.
"She is the 'best version of herself' I've ever known her to be. I know a lot of friends who've gone through similar things and it's when you have to live with your new self for a few years - that comes with a lot of struggle," Jonas said.
"I wish I could have a bit more of that. She goes out there and says, 'This is who I am.' Considering what we've all come from, it's not always easy. We feel like we have to be cautious," he continued.