Answer:
Yes
Explanation:
In the context of real estate one of the Pincipal's duties is to act accordingly to the contract details. When hiring an agent you (as the principal) are giving the agent authority to act on your behalf and make decisions that are in your best interests. This includes selling the house. If you do not actually want to sell the house and are creating road blocks for the agent then you are preventing the agent from doing their job and wasting their time/money, which would mean you are breaching your duties as principal.