Final answer:
A person who assumes they know what their partner is thinking without them saying it is called a mindreader. This approach to solving problems can lead to misunderstandings in relationships as it bypasses direct communication.
Step-by-step explanation:
A person who tries to solve problems by telling a partner what the partner is really thinking is labeled as a mindreader. This term refers to someone who assumes they know what others are thinking or feeling without having them express it directly. Such behavior can create misunderstandings and conflicts within a relationship as it doesn't give the other person a chance to share their own perspective and feelings. Leaving room for dialogue and open communication is critical for healthy interactions.