I Really Need Some Advice

It's unlike me to be this paralyzed. I mean, I do tend to take an inordinate amount of time to make a decision because I want to weigh all the factors and consequences. But this time ... I'm stuck.

I've invested a lot into a project, but I've been thinking for some time that it just isn't going to make it in the market. Because I've put so much into it, it's hard for me to look objectively at where reality actually stands.

To those of you who have walked away from something to which you've dedicated a lot of personal resources, no matter how easy or difficult it may have been, how did you walk away?

I seriously need some advice here.