In October 2005, Hawthorne Heights toured the UK with labelmates
Bayside, Silverstein and Spitalfield; it led into a two-month tour of the US with those same acts, plus
Aiden, dubbed the Never Sleep Again Tour. On November 23, 2005,
If Only You Were Lonely was announced for release in three months' time; the album's track listing was posted online ten days later. "Saying Sorry" was made available for streaming solely on Christmas Day and Christmas Eve 2005 through their
Myspace profile.
This Is Who We Are, the band's first video album, was released on January 10, 2006; it included footage from the Never Sleep Again Tour, which saw the debut of three new songs, namely "Light Sleeper", "Where Can I Stab Myself in the Ears", and "This Is Who We Are". In January 2006, Hawthorne Heights embarked on a UK tour with
Still Remains,
Aiden, and
Bullet for My Valentine. A music video was released for "Saying Sorry" via AOL Music on January 16, 2006; it was released to radio on January 31, 2006. In February and March 2006, the group went on a tour of the US alongside
Emery,
Anberlin,
June and
Bleed the Dream. From March to May 2006, the group toured with
Fall Out Boy on their North American arena tour, titled the Black Clouds and Underdogs Tour. On May 25, 2006, the music video for "This Is Who We Are" was posted online. They appeared at
The Bamboozle festival; following this, "Pens and Needles" was released to radio on June 13, 2006. In July, the band went on a tour of Canada alongside
Story of the Year and
Anberlin. Throughout July and August 2006, the band performed a number of free intimate shows; fans could gain entry by signing up with
Rockcorps. On August 7, it was announced that the band had left Victory Records, citing a lack of
royalty payment. The following month, they appeared at the
Bumbershoot festival. From September to November, the band headlined the 2006 edition of the
Nintendo Fusion Tour. "I Am on Your Side" impacted radio on October 10. In June and July 2007, the bands went on a U.S. tour with support from
From First to Last,
Secondhand Serenade,
Brighten and
Powerspace. Following this, the group appeared on the 2007 edition of
Warped Tour. In November and December, the band went on a headlining US tour dubbed Wintour. They were supported by
Escape the Fate,
Amber Pacific,
the A.K.A.s and
the Secret Handshake. Music videos were made for three tracks from the album. The video for "This Is Who We Are" was filmed at the Minneapolis stop of the Black Clouds Tour on April 14, 2006. The band later filmed a music video for "Pens and Needles" in Miami. The video was directed by Dale "Rage" Resteghini. Another music video was filmed for "
Saying Sorry". On March 4, 2021, the band announced
If Only You Were Lonely XV, a re-recording and re-imagining of
If Only You Were Lonely in honor of its 15 year anniversary. The album was released in April of that year. The band also announced The Lonely World Tour, where they will play the album in full for its 20 year anniversary, supported by
letlive. and
Creeper. ==Commercial performance==