Sure. Love is a complex emotion that can be re - experienced. In the context of the 'can love happen twice novel', the author might use different storylines to illustrate this. For example, the protagonist may have lost their first love tragically. But as they move on with their life, they find someone else who makes them feel the same or even stronger emotions. This shows that love has the potential to occur more than once in a person's life.
It depends on the plot of the 'can love happen twice novel'. Some novels are designed to show that love is a once - in - a - lifetime thing, while others explore the idea that people can grow and change, and thus be open to new love. If the characters in the novel are complex and evolving, then it's very likely that love can happen twice.