I was going to say Nicholas Sparks but you already read that, so I would have to say Jodi Picoult, though only some of her books are love stories. Audrey Niffenegger wrote The Time Traveler's Wife which was an amazing love story. Look at your local book store and you may find some new authors that you like. Kristin Hannah is also a very good writer, most of her books are about friendship but they are always a good read!