Wife / Girlfriend rage

There is a Carrie Underwood song that says, "dug my key into the side of his pretty little jacked up 4 wheel drive, carved my name into his leather seats. Took a Louisville Slugger to both headlights," something about 4 flat tires, and more.
I did my own Wierd Al like rewrite to that. "I put the Louisville Slugger right between her eyes then ran her *** over with 4 flat tires. I wasn't my truck that cheated, it was me".

Why wouldn't she just leave?

That's what I don't get.

I love CU, but I HATE that song, because.....why not just find someone that doesn't cheat?