The entire time I was writing this I was thinking of the ice cream that is awaiting me. Yummy, yummy ice cream.
Regret
(noun) a feeling of sadness, repentance or disappointment over something that has happened or been done.
Jim's relationship with Starfleet had always been shaky at best. It took his parents from his, but gave him a family. It helped him find his greatest love—and wrenched that from his hands and left him to rot.
He'd had no choice; Starfleet had made his options very clear: do whatever—whoever—needed to be done to close a deal that could end the war with the Klingons. Or, do everything morally right and doom them all.
In the end, he never really had a choice.
What added insult to injury was that he couldn't even warn Spock about what he was to do; there was never any time to give him a hint as to what was going to happen, to the pain he was going to strike down on their heads—on their hearts.
So instead of waking up on what should have been a nice, normal, loving day for them, they awoke into one that destroyed them.
Jim was pulled into a private call at the start of shift, a call that pulled him from his ship with little to no warning. He was given those dreadful options, forced into that awful choice, and come dinner time?
Well. He was unfortunately sweet talking his way into an asshole Klingon's bed, turning a golden bond dry and dusty with his unwilling betrayal. By the time the day has ended he is without a home, without a family, and voluntarily out of a job.
By the end of the day, the Federation is finally on the verge of real peace, and Jim is left without his Spock.
So, what did you think? Poor Jim :(