This is Not a Romance by Ava Devlin

Victoria “Vix” Beck has decided to marry, but she has sworn off romance.
Love is a lie told to keep girls like her small. What Vix wants is power. Position. Revenge. She intends to climb back into the glittering world that once spat her out, to sit among the very people who humiliated her, and to make them choke on her triumph. Marriage is simply the tool she needs to secure her place—and she’s more than clever enough to wield it.

Sir Ambrose Aster has never struggled a day in his life—and it’s killing him.
Cards fall in his favor, women fall into his bed, and victories come too easily to feel like victories at all. Until Vix. Sharp, ambitious, impossible Vix. She doesn’t want his charm or his affection. She wants a stage, an accomplice, and a husband who won’t mind being used as both. For once, Ambrose has found someone who makes losing feel like winning.