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Justin Bieber is keeping his promise.

After telling fans that he'd be releasing a new song every week for 10 weeks as part of his Music Mondays project, Biebs just dropped "All That Matters."

The 19-year-old took to Twitter to explain the lyrics behind his latest single, saying, "The lyrics of this song are pretty self explanatory—when you fall in love with someone, that someone can make you feel whole."

He added, "I feel like anyone who has been in love knows what I mean. The song conveys that being in love is one of the greatest feelings on earth. Love is all that matters. But the void you feel when that love goes away is gut-wrenching."

Biebs went on to say that he "worked so hard in the studio trying to put that feeling into music."

This marks the second single in two weeks from the teen heartthrob.

He unveiled the revealing tune, "Heartbreaker," which seems to be about his breakup with longtime girlfriend Selena Gomez.

At the time, Bieber described the slow melodic tune as "a song for people going through heartbreak—like I was when I wrote it."

"It means so much to me to be able to share what I was, and still am, going through, with my fans. I'm very proud of this song and I hope it gives my fans some insight into my heart."

Between the breakup ballads and revealing lyrics, the singer is clearly getting more personal on his forthcoming album.

So tell us, what do you think of his latest single?!

PHOTOS: Justin Bieber's best Instagram pics!

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