Emerald Enchantment (The Emerald Trilogy #2)
Lynette Vinet

Too proud to reveal his true feelings, Paul suffers as he imagines a growing attraction between Allison and his brother Daniel, and at last sets for Canada, leaving the two to find happiness together.
But Allison, whose fidelity and love have never wavered, follows him, and husband and wife are reunited. But is the passion they share strong enough to bridge the chasm jealousy and misunderstanding have created between them?