Writing lyrics with a phrase like 'don't leave me' can be so powerful because it taps into universal emotions—fear, longing, desperation. I'd start by setting the scene: maybe a slow, melancholic melody where the line hits like a punch. For example, in the chorus, you could build up to it: 'Every shadow feels like goodbye / Every whisper’s a lie / Don’t leave me here in the silence.' The repetition of 'don’t leave me' could spiral into a bridge where the instrumentation drops out, leaving just raw vocals. It’s all about contrast—pairing fragility with intensity, like in 'The Night We Met' by Lord Huron or 'Someone Like You' by Adele.
Another angle is using it as a callback. Imagine verses full of nostalgic details—shared memories, inside jokes—then hitting with 'don’t leave me' as a stark, present-tense plea. It’s like the character’s past happiness sharpens their current despair. Bonus points if you subvert expectations later, like switching to 'you left me' in the final chorus for a gut-wrenching twist. Songwriting’s all about emotional archaeology, digging until you strike a vein.