Editor's Note: This story includes graphic details of a suicide attempt.

Sum 41's Deryck Whibley and his wife Ari are ready to speak about a dark moment in their lives.

In an interview with PEOPLE, Deryck, 41, and Ari open up for the first time about her attempted suicide eight years ago, how they've grown as a couple since and why Sum 41's track "Catching Fire" — re-released Friday featuring Nothing, Nowhere — was the catalyst for their healing.