Without these mirrors, the romance becomes claustrophobic. The audience needs breaks from the tension to breathe.

Consider Pride and Prejudice . Elizabeth’s flaw is her prejudice (quick judgment based on first impressions). Darcy’s flaw is his pride (arrogance and social rigidity). Their relationship isn't just about falling in love; it is about the violent, painful dismantling of their respective flaws. A great romantic storyline forces characters to change who they are to be worthy of who they want.