Die for Our Ship/Music

Since music is a good way to express emotions of all kinds, of course some songs will be about how the bitch/asshole dares to stand in the way of True Love. . .

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• Even if Avril Lavigne denies that her song "Girlfriend" is about this and claims it's actually a Take That to the trope, the video has more than one whiff of it. Because the "cool punk girl" can completely throw herself at the feet of the Meganekko's boyfriend, steal him from her and drive her through the dirt just for being there, huh?
• Depending on who you ask, Taylor Swift's "You Belong With Me" has shades of this, with the Unlucky Childhood Friend (and borderline Stalker with a Crush) complaining about her cheerleader rival who "doesn't know your story like I do". In the video) the girlfriend is portrayed as a very typical and shallow Alpha Bitch who is defeated and humiliated by the Dogged Nice Girl and her beau's True Love. Yup, like in the Lavigne example, both are played by Taylor Swift herself, but it's still annoying.
• Used literally, in Good Charlotte's "Bloody Valentine".

Standing over him, he begged me not to do
What I knew I had to do 'cause I'm so in love with you

• Threatened in the obsessive-fan song "David Duchovny" by Bree Sharp:

David Duchovny, I know you could love me
I'm sweet and I'm cuddly
I'm gonna kill Scully

• Voltaire has "Ex-Lover's Lover", in which

I wait for the day when I'll finally defile
The bodies of my ex-lover's lovers
I'll pile high to the sky
The bodies of my ex-lover's lovers

• "Get Rid Of That Girl" by The Donnas. It's a fast paced and catchy song about a girl beating up and killing the girlfriend of a boy she likes. The song even ends with the background singers chanting, "Kill! Kill! Kill! Kill!"