In most sports, one does not have the opportunity to concede, or give up. Golf allows for it in match play, as does chess. One concedes only when defeat is unavoidable. You can see that it will come no matter what you do. It cannot be prevented. In short, there is no way to win, or even draw.
Is this how you feel? I get a sense from your posting that you might not. You still have too much passion; you still appear to care a lot about the relationship. This is why it hurts you so much. If you didn't care; if you were ready to concede or give up, you would be accepting of what you know must be coming. You do not sound like you are in that space. So, I guess, you shouldn't give up.
It is a bit of homespun psycho-babble from my camp, but it may be some food for thought. I know it won't make the pain go away, but maybe it will help make it seem worth the effort when things DO turn around or resolve themselves.
Hang in there. Give yourself permission to take a mental holiday from your hurt. Take a day off and treat yourself to something you enjoy that you have been putting off for awhile.
"...the true sign of insanity is repeating the same action, but expecting a different response each time!" Einstein said it, but I LIVE it!