Is a man sinful if he agrees with a shop owner to buy an item from him out of shyness, then leaves and does not return?

Question:
The questioner says: I agreed with one of the shop owners to buy an item from him, then I left and did not return to him because I had agreed with him out of shyness. The question is: Is there anything required of me in this? And is this a breach of promise?

Answer:
No, there is nothing required of you in this. You have the option; if you wish, you may buy from him or from someone else. As long as you have not concluded the contract with him and the contract has not been finalized, you may withdraw, and you may buy from someone else without any impediment. You are looking for what is best for you. Yes.
If the contract was concluded between you and him while you were still in the assembly, you have the option, and he also has the option. The two sellers have the option as long as they have not separated. This is so that you may have leeway in your choice and not be bound by something that may cause you harm. You should have leeway in thinking and deliberation. This is not considered a breach of promise; it is a right for you.