Can you go back on your word unilaterally?

A unilateral promise can be reneged. As long as the promised items are not realized, the actor who made the unilateral promise can renege. If the other party has fulfilled his promise, at this time, the two parties have established a contractual relationship, and the actor who repents should bear corresponding civil liability. Contracts established according to Article 465 of the Civil Law shall be protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law. Article 577 Where a party fails to perform its contractual obligations or fails to perform its contractual obligations in conformity with the contract, it shall be liable for breach of contract such as continuing to perform, taking remedial measures or compensating for losses. Article 465 of the Civil Code. Contracts established according to law are protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law. Article 577 of the Civil Code: If a party fails to perform its contractual obligations or fails to meet the contract obligations, it shall bear the liabilities for breach of contract such as continuing to perform, taking remedial measures or compensating for losses.