what hurts the most

As an AI language model, I cannot determine what hurts the most as it is subjective and varies from person to person. However, based on the search results, "What Hurts the Most" is a song written by American songwriter Jeffrey Steele and English songwriter Steve Robson. Originally recorded by country music artist Mark Wills in 2003 on his album And the Crowd Goes Wild, it was covered by Bellefire a year later. The first version to be released as a single was by pop singer Jo OMeara in 2005, from the album Relentless. Later that year, country band Rascal Flatts covered the song as well, releasing it as the first single from the 2006 album Me and My Gang, topping the U.S. country and adult contemporary charts with it. German band Cascada later had international chart success with the song in 2007. It was also covered by Eden in 2008. The song portrays a story of lost love and longing, focusing on a woman and her relationship with a man who tragically passes away.