A Castle in the Sky: Fern & Connor by Raegan Salander

Fern thought that marriage meant partnership, love, and the quiet safety of family. For four years, she tried to believe that—tried to ignore the sharp edges of a mother-in-law who looked down her nose at her, her husband’s ex who lives too close for comfort, and a husband who was always looking the other way.
But when her husband’s negligence lands their little girl in a hospital bed, Fern can no longer swallow the excuses. She is done being an afterthought in her own marriage.
Conner insists he loves her, but love hasn’t keep their child safe. Love doesn’t silence a mother-in-law’s whispers or stop an ex from poisoning the very air around them. Love isn’t enough—not when Fern’s entire world has been built on the shaky ground of compromise.
And as the fractures in their marriage widen into fault lines, Fern has to face the question she’s been afraid to ask :

What if walking away is the only way?