"I Gambled My Heart" is not a song by Buddy Holly. It seems that you may have mistaken the artist. Buddy Holly was an influential and popular American singer-songwriter in the 1950s. He is known for his hit songs like "Peggy Sue," "That'll Be the Day," and "Everyday." However, based on the lyrics you provided, they reflect a theme of lost love and heartache. The songwriter expresses the pain of loving someone deeply and then realizing they have been betrayed or abandoned. They wonder why a true heart must suffer the consequences and be left broken and empty. The lyrics suggest that the songwriter gave their heart to someone, but unfortunately, that person didn't value it, causing them to feel sad and blue. The song talks about the regrets and questions that arise when one has experienced the pain of lost love. The writer compares it to gambling, where they took a risk with their heart and ultimately lost. They mention that someday the person who caused their pain will also understand what it feels like to be blue when they too gamble their heart and lose. Overall, the song portrays the complexities of love and the emotional turmoil that can come with it. It depicts the sadness and confusion one experiences when a deep connection is severed.