"Jealous" is a song by Filipino singer Nina from her 2002 debut studio album Heaven. It was released as the album's second commercial single in February 2003 by Warner Music Philippines. The song was written by international songwriters Shelly Peiken and Brett Laurence, and it was produced by Ferdie Marquez. The song tells a story of a girl who is in love with her ex-boyfriend that has a new girlfriend. She narrates how jealous she is with the girl, and how lucky the girl is. She also promises to wait for the boy, the moment the girl leaves him.

Upon release, the song received generally positive response from fans and critics alike, becoming a commercial success and earning Nina seven awards—the most number of awards received by a Heaven song. These notable awards include an Awit Award for Favorite New Female Artist, MTV Pilipinas for Favorite New Artist in a Video, Candy Rap Award for Favorite Female Artist and Teens Voice Award for Favorite Female Artist. It also became Nina's first hit as a breakthrough artist. On August 20, 2002, the song was made available on digital download through iTunes and Amazon.com MP3 Download on January 23, 2007.

The single was accompanied by a music video that is entirely different from the previous single "Heaven", where Nina portrays a girl who ended her relationship with a guy. She later finds out that her ex-boyfriend now has a new girl, and she gets jealous of the girl, admitting that she is still in love with the boy. Throughout the video, she is seen collecting her pictures with her ex-boyfriend and throwing them from the rooftop of a building, suggesting that she lets go of the memories.

At seventeen, Nina became a vocalist of the XS, The Big Thing, MYMP, Silk and lastly, the Essence. After college, she recorded an amateur demo CD with the help of a friend. It was composed of three tracks, including the Steve Perry song "Foolish Heart", "Breathe Again" and "Against All Odds (Take a Look at Me Now)", recorded in a home studio with only a guitar for accompaniment. After listening to the demos, Warner Music managing director at that time, Ricky Ilacad wanted to sign her up even without seeing or hearing her in person. Two months after her father died of heart attack in the United States, she signed her first contract with Warner Music. Under the direction of Warner managing head Ilacad, foreign songwriters and arrangers from the United States and Korea, including Shelly Peiken and Guy Roche, were hired for the production of the album. The album is heavily influenced by jazzy lounge pop-R&B and composed of songs that are reminiscent to the sound of international records at that time.

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