When is enough enough?

I have been struggling with something lately and I am having a hard time deciding if I should push on or call it quits... Normally I am one who just keeps on pushing and doesn't give up, but sometimes that can really be a fault. If the negatives out weigh the positives maybe its time to give up the fight. I go back and forth on this a lot. Some days I think I am so done, others I think I can I hang in their for a while and see how it goes. I am just not sure what to do. I guess for now I will hang in there but maybe I will start to check out some of my other options...just to see.