You do not always have to finish what you start. If the negotiation you have entered is taking you nowhere, abandon. The ability to finish what you started will build you an awesome reputation but it may not always be profitable. A man who is successful in everything he does is a very rare . Most of us do not possess this talent and that is fact we must accept. It is better to be abandon and gather our strength to start anew.
Abandon things that does not work out is not a sign of weakness but strength.