If you haven't agreed to the renegotiated offer, it's your right to reject that offer. You haven't negotiated a purchase & sale agreement, or accepted any deposits or anything from the potential buyer, right? If there's no agreement, there's no contract, and you're not liable for anything.
And then if you decide to stop listing the house, I don't think you need to pay anything. Your agent makes money when your house sells, they agree to represent you and your best interests, and if you decide that your best interest is to not sell your house, then they have to respect that. If you're worried about letting your agent down or hurting your relationship with them (if it's a friend or osmethiing) blame it on COVID... "Y'know... with COVD... we're just scared about my job changing and selling the house and there's too many unknowns, so we want to wait it out a while longer, I'm sorry thank you for your help blah blah" You probably signed an agreement with your realtor when you hired them, the realtor signed a document that said they're representing you and your best interests (this is required where we live if you have a realtor, and prevents, say, a realtor from working wiith one of their co-workers to drive up the price of you rhouse so they make more money, or vice versa, to help out a friend, or their realty business, etc), so review those documents. IIRC they're pretty much in plain english.
FYI, I'm not a realtor, but am close with a real estate attorney and we sold our old house and bought a new one last year so this is fresh experience for us. If there is a real estate attorney in here please correct me if I'm wrong. You probably don't have an attorney lined up yet for your sale, right? I'm lucky that we've always had a real estate attorney in the family so I can ask him questions like this without getting billed :D