Spock/Bones... betrayal

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Hi.

I'm looking for the fic where Spock and Bones are together, but Spock cheats on him with Jim. For some reason, I think Spock was not telepathic in this fic and didn't know Bones was in love with him? Anyway, Bones walks in on S/K having sex and leaves the Enterprise. But at the end, Spones get back together, I think.

Anyone remember where I can find this fic again? I remember it was really, really, really long.

Thank you in advance!