Ed Sheeran is heating up the charts with his new album, ÷ (Divide), and ET found out that the English pop singer is loving the fan response.

"I spent about six hours last night watching YouTube reaction videos," Sheeran admitted to ET's Jennifer Peros on Monday. "It just makes me smile the whole time."

WATCH: Ed Sheeran Talks New Inspiration for 'Divide'

The 26-year-old musician has been garnering rave reviews for his latest album, which features its fair share of sad songs despite all the positives in the artist's life. Sheeran explained his writing process and why his music tends to tug at the heartstrings.

"I've always made my albums on the road. The road isn't always happy. It's not the most stable place for a relationship or a life," he said, revealing that Divide is his first album that was written after some time off. "There are some dark, dark moments on the album. My life isn't like that now. Those songs were basically written a while back and I felt they should be on the album, because you can't just have an album that's all positive. It has to have light and shade."

Right now, one of the brightest spots in his life is his girlfriend, Cherry Seaborn, whom he's known since childhood. Sheeran told Peros that the fact that he and Seaborn have known each other since he was 11 years old helps him keep a healthy perspective on life as he gains more fame and success.

MORE: The 24 Best Lyrics Off Ed Sheeran's New Album, 'Divide'

"I think it's cool," he said. "You don't get away with a lot, because she can call you out on anything."

With the success of his latest album, Sheeran's future is full of promise, and he said in 10 to 15 years he "would love to still be making music."

"I'd love to still be touring," he said. "I want to be doing this for the rest of my life."

WATCH: Ed Sheeran Covers 'Shape Of You' On Classroom Instruments With Jimmy Fallon & The Roots

And in 10 to 15 years, Sheeran might actually be in even better shape. He explained how he's been focused on living a healthier lifestyle after years of neglecting his body.

"I chain-smoked. I drunk a lot of alcohol and ate very unhealthily and I just kind of cut 70 percent of that out," he said. "I still do all those things, but my dad said, 'Everything in moderation.' I just basically needed to moderate."