"It's probably the worst feeling in the world, when you're deeply and madly in love with a woman and you know she's not feeling you the same way, and you don't know why"

In this quote, Bruno Mars is revealing the extreme discomfort and heartache that features being in love with somebody who does not reciprocate those feelings. He explains it as the worst feeling in the world, emphasizing the depth of the emotional chaos he is experiencing. The use of the words "deeply" and "madly" communicate the strength of his love for this lady. Nevertheless, regardless of his strong feelings, he is aware that she does not feel the same method, and this lack of understanding adds to his distress. Overall, the quote catches the pain of unrequited love and the confusion that frequently accompanies it.