If the house is not sold, the contract can be broken, but the buyer's losses caused by breach of contract must be borne.
 If you unilaterally breach the contract, the other party will probably sue you and let you bear the liability for liquidated damages.
 The contract is that both parties express their true intention that the contract is valid, and clearly stipulate the terms of breach of contract. If the other party does not breach or fail to perform, and unilaterally breaches the contract, it is more likely that the litigation court will support the other party's claim.
 Article 577 of the Civil Code [Liability for breach of contract] If a party fails to perform its contractual obligations or fails to perform its contractual obligations in accordance with the agreement, it shall bear the liability for breach of contract such as continuing to perform, taking remedial measures or compensating for losses.
 Legal basis
 Article 577 of the Civil Code of the People's Republic of China [Liability for Breach of Contract] If a party fails to perform its contractual obligations or fails to perform its contractual obligations in accordance with the agreement, it shall bear the liability for breach of contract such as continuing to perform, taking remedial measures or compensating for losses.