"I didn't want to do anything that wasn't genuine, and I was afraid of phoning it in or forcing anything," Perri told Radio.com in a recent interview. "I remember laying on the floor of my house just crying. Good crying and sad crying at the same time. I was just trying to believe the things that had happened."

In doing that she sat down at the piano, because the only way she knows how to feel better is to write. "Even if absolutely nobody listens or anybody hears these songs, they heal me in the moment," she said. "I sat at the piano and wrote this song called 'Trust.' As soon as I did I had a eureka moment, and I immediately knew what I wanted to say."

Perri had been in and out of many different relationships where she would alternate trusting her head and her heart, and she couldn't figure out which was the right way to go.

"I was trying to find the right thing and make the right choices, and because none of the relationships worked out I felt as though I just didn't trust me. So I wrote a song about it. In that moment when I wrote the song, I named the album Head or Heart. I knew that 'Trust' would be the first song on the album and set up the album, and I knew that the theme of the album would be split into two � into head songs and into heart songs."

One of those "heart" songs, "Be My Forever," is the happiest song she's ever written. The song features Perri's friend, singer-songwriter Ed Sheeran, something she's been hinting at but hasn't revealed until now. One of her favorite songs on Head or Heart, Perri wrote the song with Jamie Scott while in London this past January.

"I was the most in love I may have ever been in my whole life, which is awesome because I knew I had a happy song in me," she said. "As much as I love the heart-wrenching stuff, I didn't want to force a happy song, and I think you can always tell when a song is fake. I remember going in the studio with this guy and him looking at me and I was glowing. And I'm like, 'I'm so sorry. I'm in love. This is going to be awful. We're never going to write a song.'"