Her Sexy Cop by Amy J. White

Lindsay Lewis has been keeping a secret. Her ex-husband, a decorated detective from a beloved family, wasn’t just difficult, he was abusive. She hoped that signing the papers that separated them would mean starting a new life, but the moment that she starts dating someone new, she discovers that he hasn’t completely given up on keeping her to himself.
Alexander Boone is one of the few people who knows exactly how horrible Lindsay’s ex is, they used to be best friends. Falling for the pretty woman across the street was an accident, finding out that she was Jarred’s ex felt like destiny. When she pulls away, he knows it’s because of his former friend. This time, Alex isn’t going to just give up on the only woman that he’s ever loved…