Well, my first reaction is to look for a third option, but thats not the question, so...
I would not be able to stand seeing my SO being tortured, and would thus do it at some point. How long that would take, I don't know, but I reckon sooner rather than later, as I would be pragmatic enough to realise that it would be better to do so earlier rather than later, as my SO would be tortured less. I'd still hate myself for doing it, but I think overall, it would be the better choice.
And yes Galloism, you do have some sick dreams.