[quote=Pepperm1nts]
I just started playing though. How would anyone know if I made this move to "screw someone over"?. It's not like I have a history. If anything, I'd think I could be trusted given I've been the one who - even before joining - kept stressing "story over victory."
[/quote]

While I don't think that you are intending to screw over the allies, but swapping sides at the moment does screw them over, whether or not you intended it.