When to let go?

One of my main beliefs in life is that flexibility is life and rigidity is death. But I'm also a go getter. I believe I have the power to turn things around if I so wish it. So then, at what point do I let go?
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I started a exploring a particular field of career over a year ago. I started from the scratch and built it to a certain commendable level. This took me more than 6months of my time and resources. Most of all it took 6months of discouragement from people close to me but I kept pushing because I felt they won't understand the process. I just need to show them result. But 8 months down the line, I cut corners and did some manipulations just to get me to the desired threshold. Now I'm at the threshold and it seems it was all for nothing and the purpose for which I started it couldn't be found again. And now I'm at the point of letting go but can't help but feel bad about the time and passion I invested in it for over a year.
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It kind of reminds me of a toxic relationship. Often times people find themselves in a toxic relationship which they acknowledge to be toxic and bad for them but attachment won't let them give up on such relationship and move on. They hold on and hope that some kind of miracle occur or that their one sided love is enough to nurture the relationship.

If all is well and things are going right, result should be proportional to effort. As someone that is highly result oriented, I get disturbed when I put in a measure of effort and it doesn't bring proportional result. This is not impatience, it is just what I deserve and what ever other person out there giving their best deserve. I'm in some sort of dilemma right now. I feel I should let it go and move on but my heart tells me to hold on and that I'm almost at the end of the tunnel.

Tell me...when do you let go? Do you apply logic and common sense or do you follow your heart?

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