Rayna lays it all out in this scene from the Nashville episode "Guilty Street."
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So... this happened on Nashville. Can't say we saw it coming.
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Rayna takes a moment to relax on Nashville. "Guilty Street" is the 16th episode of the show's second season.
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Nashville Season 2 Episode 16 Quotes

The difference is I'm a grown up and that girl is a kid. A very fragile kid.

Rayna [about Scarlett]

I loved the woman I thought I knew. I never would've married this. Or done what I did.

Teddy

Nashville Season 2 Episode 16 Music

  Song Artist
A thousand horses landslide Landslide A Thousand Horses iTunes
The court yard hounds watch your step Watch Your Step The Court Yard Hounds iTunes
Song Come Find Me Clare Bowen