You are not considering the downside of all of this. (Since I get paid for negotiation let me give you my thoughts.) By "giving the other person a chance" you are giving them power over you. Which they could use to extract something from you in exchange for your agreement. Now this may or may not matter depending on the person you are with, but I will point it out so you know that in some cases there could be a downside by "running something by the other party". And yes, there is negotiation in relationships as there is in business.