"I Just Don't Know What to Do with Myself" is a song originally written by Burt Bacharach and Hal David. Elvis Costello recorded his own version of the song in 1978 for his album "Girls Girls Girls." The song expresses the feeling of being lost and unsure of what to do after a breakup. The singer is so used to being in a relationship where they did everything together, but now that they are no longer together, they struggle to find purpose and direction in their life. They long for their former partner and feel a deep loneliness without them. The lyrics compare the singer's need for their ex-lover's love to how a summer rose needs both sun and rain to thrive. They express that without their love, they feel an emptiness and pain. The singer hopes that if their ex-lover's new relationship doesn't work out, they will come back to them. They will be waiting and willing to try again. The repetition of the line "I don't know what else to do" emphasizes the singer's helplessness and desperation. Overall, the song portrays the emotional turmoil and longing that comes with a breakup, as the singer grapples with the absence of their former partner and searches for meaning and fulfillment in their life.