"Little Do You Know" is a song by the musical duo Alex & Sierra, released in 2014 on their album "It's About Us." The song is a heartfelt ballad that expresses emotional vulnerability and the struggles of a relationship where one person is hurting internally while the other may not fully realize it. The lyrics depict a person breaking down emotionally but hiding their pain, asking for more time and understanding from their partner. It highlights themes of love, pain, forgiveness, and patience within a relationship. The song is known for its emotional depth and the interplay between the two voices representing different perspectives within the relationship. The female perspective reveals the internal hurt and need for healing, while the male perspective offers patience, love, and reassurance. The chorus emphasizes waiting and loving despite the pain and fear. This song has resonated with many listeners for its raw emotional honesty and has been covered and shared widely on platforms like YouTube and Spotify.