There are a few series that could fit this description. One such series could be 'Love's Double Triumph' where the hero has two distinct and fulfilling romantic endings.
You might want to check out 'Everlasting Love Duos'. Here, the hero's storylines branch out, resulting in two separate happily-ever-afters. The plot twists and turns keep readers on the edge of their seats.
I think 'Hearts Entwined' might be what you're looking for. In this series, the hero's journey leads to two different but equally happy resolutions in the romance department. It's a unique and engaging take on the genre.