The song "I Want You Back" by US5 is about longing for a lost love and desperately wanting them back in the protagonist's life. The lyrics convey feelings of regret, nostalgia, and the realization of past mistakes. The song reminisces on the past when the two individuals were not just friends but something more. The protagonist expresses that they never expected the relationship to end and now wants their former partner back. They recall looking into their eyes and feeling alive, but now feel blind for not realizing the value of their love at the time. The protagonist cannot forget the day when their partner left them, and they acknowledge that life without them is driving them crazy. They admit that they made mistakes but genuinely want a second chance to make things right. They desperately want their former partner to understand their remorse and the depth of their feelings. The lyrics reflect the protagonist's acknowledgment that they were foolish to believe their partner would stay in their life after all that was done. They recognize the pain of their partner's absence and express their inability to forget or move on from the relationship. The song conveys a strong desire for reconciliation and a plea for their partner to come back into their life. The protagonist believes that their former partner is everything they ever needed and cannot let go of the hope that there might be a way to mend the broken relationship. Overall, "I Want You Back" is a heartfelt song that conveys the emotions of longing, regret, and a sincere desire to have a second chance at love.