"I'm Not the Only One" is a song by Sam Smith from their debut album, "In the Lonely Hour," released in 2014. The song explores themes of heartbreak and betrayal, focusing on the pain of loving someone who is unfaithful. Its soulful melody and poignant lyrics resonate with listeners who have experienced similar emotions. The music video for the song features a narrative that illustrates the struggles of a couple dealing with infidelity. It highlights the emotional turmoil and the impact of dishonesty in relationships, reinforcing the song's message that many people face similar challenges in love.