Dear {Name},
You’re right. I gave up. I simply could not {action/responsibility/etc.} anymore.
I could argue that there is value in knowing when to cut one’s losses, or wax poetic about sunk cost fallacies. But the truth of the matter is, I was just done.
What I regret is not looping you into my thought process sooner. I understand that my decision to end {project/affiliation/relationship/etc.} resulted in significant fallout to you, and for that I am sorry. If I had it to do over, I would have communicated better.
Thank you for hearing me out. I wish you the best in the future, and I hope you feel the same about me.
Sincerely,
{Name}
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