Letting Go at 40 - L B Dunbar

Before his best friend died, he asked Mason to look after his wife. He didn't know Mason had been in love with her for twenty-five years.
Anna Kulis has lost her husband. Their love was a perfect kind of love; a once in a lifetime experience. She never intended to fall for anyone again. Never expected to have this reckless attraction stirring inside her. And she never thought her emotions would run wild for the one man she shouldn't be attracted to - her late husband's best friend.
Mason Becker has a secret. As a renowned ladies' man, he's been in love with his best friend's wife for decades. After his friend's untimely death, and a period of grief, Mason finds himself in a compromising position with the one woman he didn't think he'd ever have. And that night leads to complications - namely, a desire for more.
Letting go can be one of the hardest tasks for the heart.
Opening up to a second chance at love can be even harder.