Of course, you should pay attention to your feelings and my wishes when buying and selling this kind of thing.
If the market price of your house is really higher than the contract price of 50 thousand yuan. I think you also have the right to go back on your word.
You have a choice, right? It's up to you.
First, let the buyer have no money loss, he just wastes time and feelings. Give a reasonable reason why you don't want to sell the house, if you don't want to tell the reason in your heart directly.
Secondly, I don't think buyers can buy your house and lose their marriage and happiness. The house in the world is not your house.
From the perspective of benevolence and righteousness:
If you can recover the loss of 50 thousand, it is kindness to yourself and your family.
If you give up 50 thousand, be kind to your buyer. This benevolence has different interpretations for different people. I can only say that society is cruel, and maybe your other half won't appreciate your kindness. In other words, maybe the other person just likes the price of your house.
To be a wise man is to be worthy of yourself and not hurt others.
Choose a way that will make you feel most comfortable, so that you won't ask for 50 thousand more, blame your conscience more, and won't make yourself depressed for asking for 50 thousand less.
Also, be sure to determine the market price of your house. In case people's feelings are hurt here, it's not worth it if it hasn't been sold there.
I wish you find a suitable solution and live a happy life.