You Don't Know How It Feels

Based on this prompt: Imagine Person A has a crush on Person B, but Person B doesn't know and has a crush on someone else. Person B vents their frustrations about their unrequited crush to Person A all the time. After a particularly long rant, Person B goes, "You just don't know how bad it hurts to like someone so much and for them to have no idea how you feel." Person A looks at them with a sad smile and says, "No, I guess I don't."