Worst subterfuge moments

so im playing an eight man game and I ally with pink and brown, later pink is a sure winner considering that its just me, orange, red, and light blue (who has 2 hours before autoresign). im second and red is third. I feel pretty good right up until pink I have to flee to safety as someone goes for my queen. Pink proceeds to kill me with their queen hunter combo I helped them establish. They tell me it was to "secure victory" even though they had 30 hours until win. I ended up placing behind the auto resign.
TL:DR some poop sandwich out diplomacy'd me for no reason and made me lose my opportunity for my first ever medal
TL:DR some poop sandwich out diplomacy'd me for no reason and made me lose my opportunity for my first ever medal