I know what we do is right but right doesn't always mean easy.

...life is in Fate's hands now. You made your choice to stay... it's too late to change that, so stop agonizing over it.... You're making my scales itch. Saphira, from "Eragon

Nothing out of the ordinary ever occurs to me when I'm by myself. But you attract duels, ambushes, immortal enemies, obscure creatures such as the Ra'zac, long-lost family members, and mysterious acts of magic as if they were were starving weasels and you were a rabbit that wandered into their den.

Heart broken-he felt a deep ache in his chest, like that of a sore muscle, and each beat of his heart pained him

Regardless of whether I can shift my affections to another - and the heart, as you observed, is a notoriously fickle beast - the question remains: should I?

It got so that when he closed his eyes, letters and words danced in his mind. He thought of little else during that time.

They have not the heart for this battle. So think of your families, think of your homes, and remember it is they you are fighting for.