Saint Valentine (No Saviors Here) by Shantel Davis

Saint, a ruthless heir to a crime empire.
Aria Heart shared a past with Saint and has worn his ring for 17 years.
When Saint forces her into an arrangement that binds them in both a marriage and a dangerous game of Villan vs. Damsel, she must navigate the treacherous waters of loyalty, lust, love, and survival.

"I stole her. She ruined me. Now, we're bound for life." – Saint