When I spoke of my actions in that other world with Temeraire, he told me that there are infinite universes, where anything that could possibly happen must happen. That there were universes where, perhaps, he would be purple with yellow spots, or other such ridiculous notions.
I can't say I understand it entirely. He's much cleverer than I. But if there must indeed be a universe where even the most unlikely outcome is possible, then you should not feel guilty for what another version of you does in them. What's important is how you conduct yourself in this universe.