"But I'm Not / Outro" by Gilbert O'Sullivan is a song about a person who is determined to prove that they are not a fool or cruel in a relationship. The lyrics depict someone who wants their partner to stay committed and faithful, warning them not to change their mind or be unkind. The protagonist expresses their frustrations and insecurities, as they fear their partner may cheat on them or be disloyal. They emphasize that they are not a fool, despite what others may say or think. They believe their actions and commitment to the relationship prove their worth. The song also highlights the protagonist's unwavering dedication to their partner. They have fought for the relationship and have thrown away any negative experiences or dreams that may have come their partner's way. They hope that one day their partner will acknowledge the efforts they have made and recognize that everything they said and did was for the best. The outro of the song serves as a continuation of the protagonist's message. They state that they are not quite finished yet and that there is another side to explore before they go. It hints at a desire for growth and the need for their partner to understand their perspective. The song concludes with a plea to help them explain their feelings. Overall, "But I'm Not / Outro" is a heartfelt song that touches on themes of loyalty, commitment, and the desperation to prove one's worth in a relationship. It expresses the protagonist's determination to be understood and valued by their partner.