>who is, contrary to what we were told, winning the war

So you haven't read any documents in the end? Because the worst that these documents say is "mostly stalemate, losses here and wins there". Of course Ukraine isn't overwhelmingly winning, but if you believed that, you just believed war propaganda. You shouldn't be angry at it, because it's literally what happens in every, single war. Every camp will overstate their wins and downplay their losses to the public.