That's intentional. When you reveal a trump card, the voice in your heart has something to say to you. This game trusts that you'll know how to listen.
Sometimes the message will be confusing, and that can put a strain on the relationship. (How much do you trust the voice in your heart? How well do you really know them?)
Other times, the meaning will be obvious. Sometimes it'll hit you hard, and sometimes it will land very gently.