Rules of Engagement by J.T. Geissinger

Love is a battlefield for a quirky matchmaker and the cocky football star who hires her to find him a wife.
As the owner of Perfect Pairings matchmaking service, Maddie McRae earns her living helping others fall in love. And one thing the sweet Southern belle knows for sure is that the foundation of wedded bliss is built on similarities: opposites might attract, but they don’t stay together.
Enter Mason Spark.
Rude, arrogant, and notoriously allergic to monogamy, the hottest quarterback in the NFL is Maddie’s polar opposite. He’s also her new client. Her gorgeous, infuriating new client who’s paying her an outrageous sum of money to find him a wife. With his multi-million dollar contract on the line due to his behavior on and off the field, bad boy Mason is willing to pretend to settle down.
But when he starts to fall for the adorkable matchmaker who can’t stand him, the playboy finds himself in the game of his life to keep something he never thought he’d lose—his heart.