There must be a reason why someone is about to give up. Personally I think giving up is harder than starting something from zero.

If it was me, I will take my time to really think it through, why do I start this? What am I doing this for? Then I will consider the damage it has take this far, and maybe if it's really bound to end after all, I will give it another one last try so I will not have any regrets when I finally giving it up.