I gravitate towards books where the central conflict isn't just a silly misunderstanding. Give me a history that's actually hard to overcome. Sally Thorne's 'The Hating Game' gets recommended a lot for second chances, but the struggle feels a bit manufactured to me—it's more about internal tension than external, realistic baggage.
For something that feels more grounded, I'd suggest 'One True Loves' by Taylor Jenkins Reid. It handles an impossible situation—a woman whose husband is presumed dead, she moves on, and then he returns. The ethical and emotional struggle she faces, and the real damage done to both relationships, feels painfully authentic. It’s less about a grand romantic gesture and more about the messy, heartbreaking work of choosing a life.
Another one is 'Love and Other Words' by Christina Lauren. The reason for the separation is a profound, shared trauma they couldn't face together as teens. The book spends a lot of time in the past, building why their connection was so deep, and then shows how that very depth is what makes confronting the truth so terrifying and slow. The reconciliation isn't guaranteed, which makes the struggle feel earned.