Justin Timberlake discusses the breakup with 'N Sync for the first time on Oprah's Master Class.

It's been years since Justin Timberlake was part of the mega boy band  'N Sync, and he has finally broken his silence about the breakup. This was one of Justin's most important decisions of his career, discussing that choice with Oprah.

Justin says leaving the group that brought him to fame was one of the hardest decisions of his life, even to this day. He goes on saying it was difficult to say goodbye to that era. But, he knew it was the right thing to do because he "felt the music change."

Just to reminisce, here is the very first video 'N Sync music video, 'I Want You Back'

Here is the second to last video Justin did with *N Sync 'Gone', originally written for Michael Jackson. That's a whole other story.

Here is the last video with them all together 'Girlfriend'

Then in 2013 on the MTV Video Music Awards they reunited...

For more on this, watch the video from Oprah's Master Class, set to air Sunday, May 25th on the OWN network.

[OWN]