The speaker begins with a shrug at the whole world. They don't mind being seen as a villain, and they say they wouldn't even blink if everyone else died. It's a deliberately harsh, almost defiant opening, the voice of someone who has stopped caring what people think.
Then the poem turns on a single word: "but." When the subject is "my darling," that hardness falls apart. The speaker's heart doesn't just ache, it shatters, and the pieces cut into their lungs with every breath. Breathing, the most basic act, becomes painful.
The contrast is the heart of it. The speaker seems cold toward everyone except one person, who holds enormous power over them. The mood is raw and intense, a mix of tough-guy bravado and helpless tenderness. The title, "Inamorato," means a male lover, which fits the poem's focus on devotion, though the lines themselves don't say whether the pain comes from loss, fear, or simply loving so much.