The song "Gun" by Mick Jagger is about a toxic and abusive relationship. The narrator of the song is the victim of the abuse and is expressing his frustration with the situation. He asks why his partner doesn't just get a gun and shoot him, as it would be a more merciful way to end his suffering. Throughout the song, the narrator describes how his partner takes advantage of him, pushes him to the edge, and breaks him down emotionally. He feels helpless and trapped, and wonders why his partner won't just end things instead of continuing to torture him. The lyrics also suggest that the narrator's partner is getting support from their friends, who see the abuse as self-defense. The narrator feels like he has no one on his side and is being gaslit into thinking that he is the problem. Overall, "Gun" is a powerful and emotional exploration of the dynamics of an abusive relationship. It highlights the desperation and despair that victims feel and the need for support and understanding from those around them.