As soon as the feeling became mutual, the spell would break.

However—

That's right. Their love had already become real a long time ago.

Rather than tell the prince, she would never see him again.

That love she thought was oh so strong would vanish just like a bubble.

The prince took her hand and confessed to her.

When the princess found out... She decided that even if the feeling was fake, she didn't want to lose it.