Most by Anthony Trollope have happy endings.
Trollope was prolific and tended to write long novels. Shorter possibilities, not part of a series, are
Rachael Ray and
Dr. Wortle's School. His most popular nowadays may be
Barchester Towers, the second in a series that begins with a shorter one,
The Warden.
Trollope's subject is men and women, especially as they are together -- seemingly an appropriate subject for you and your boyfriend to discuss
P.S. I agree with your boyfriend about Jane Austen.