The Bromance Book Club By Lyssa Kay Adams

(Used, paperback)
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Nashville Legends second baseman Gavin Scott's marriage is in major league trouble. He’s recently discovered a humiliating secret: his wife Thea has always faked the Big O. When he loses his cool at the revelation, it’s the final straw on their already strained relationship. Thea asks for a divorce, and Gavin realizes he’s let his pride and fear get the better of him. 
Welcome to the Bromance Book Club.
Distraught and desperate, Gavin finds help from an unlikely source: a secret romance book club made up of Nashville's top alpha men. With the help of their current read, a steamy Regency titled Courting the Countess, the guys coach Gavin on saving his marriage. But it'll take a lot more than flowery words and grand gestures for this hapless Romeo to find his inner hero and win back the trust of his wife.