Since You Stole My Heart by Kajal Rai

Before the wedding, he was her sister’s best friend.
Before the vows, they were just roommates.
Now fate has bound them together in marriage,
And the one man who was always off-limits is now her husband.

A wild, rebellious jewellery heiress, Kashvi Kashyap hides a vicious storm of secrets behind her smile. Haunted by guilt she can never escape, she dedicates her life to the charitable work of her family’s foundation.
But when her estranged, ruthless father resurfaces and threatens to destroy everything she has fought to build, Kashvi is forced into the one choice she swore she would never make.

Marry her sister’s best friend, Swayam Sharma.
Swayam knew his wife was a beautiful trouble wrapped in defiance, just like he always saw the fear in her eyes and the scars behind her sarcasm. And it awakens a fierce, primal need to protect her at any cost, even if she fights him every step of the way.
But when the ghosts she buried drag danger to her door, Kashvi must choose: Will she finally confront the demons of her past… or lose the one man she never meant to fall for?

If you crave slow-burn romantic suspense, a fiercely protective man hopelessly drawn to his best friend’s sister, and a marriage of convenience never meant to turn into love, Since You Stole My Heart will steal your heart.

This is an interconnected series, and Book 2 is recommended for a deeper understanding of the Ever Since universe.