Nick Jonas says music is the "best therapist" he's ever had.

Speaking in his Last Year Was Complicated documentary, he said: "There’s no better release for me than creating. I just had to do it, I had that instinct. The minute she [his ex-girlfriend Olivia Culpo] left, I was alone in my apartment. I was like, ‘I have to come and get out of the city and write.' "I came up here [to Mammoth Mountain] with my trusted group of collaborators. Immediately I was OK. I’ve tried talking to people and doing that thing, but I don’t know. [I'm] too in my head and unwilling to open up and get deeper. I feel like the music is the best therapist I’ve ever had."

Meanwhile, the 23-year-old singer previously admitted it was important for him to get "vulnerable" on his album.

He shared: "I mean, it's always difficult to open yourself up that way, but it's important to get vulnerable. Right now, at this moment, Beyoncé and Drake and all these artists are really embracing vulnerability; it makes a huge difference. I'm working my hardest to lay out my stories and my music and connect with my fans - and my own self - in that way."

And the 'Levels' hunk says he has "poured everything" into the LP.

He wrote at the time: "I’ve been making this record for a year and a half ... Pouring everything I have into it. Tomorrow night I’m gonna show the world the first single. When I first started making I thought I knew what it would be about ... Then I had a breakup. It then became very clear what this thing would be about ... And that I would need to dig really deep.

"S**t is too real sometimes ... Reliving some of these real life experiences through this music is hard. But I know it’s important that I do it. I want to be an open book in my art..The first song you’re gonna hear tomorrow night is about how I literally can’t open up and be vulnerable with someone. (sic)"