Burning Star by Michelle Madow

The gods want them broken. The stars have written their end. But they’ll go down together before they ever give up.
Sapphire Hayes is bound to a winter prince who no longer knows how to love her, and chosen by a goddess who expects her to save the world.
Riven Draevor, the Prince of the Winter Court, loved Sapphire—until he bargained that love away in a fae deal to save her life, leaving him cold, hollow, and haunted.
Now they’re forced into a political marriage, ready for war, and pulled into the Cosmic Tides—a realm of starlight, fate, and memory, where the future is written in blood and the past refuses to stay buried.
When they find a monster waiting beneath the stars, it doesn’t just ask them to fight. It demands they destroy each other… until only one of them remains alive.
Meanwhile in the Night Court, Zoey is falling, too. Not into death, but into the arms of Aerix, the bloodthirsty prince who watches her like a secret, kisses her like a threat, and kills anyone who touches her.
She’s playing the long game. She swears it’s just strategy.
But what happens when it becomes more?
The gods are watching. The Night Court is rising. And the only weapon left that might save them all is a celestial disc wrapped in love, pain, and starlight.