This is annoying. NPCs will continue to break alliances even if you have 100+ attitude with them. Hell, even if you have cordial relations, they still think it's a great idea to break the alliance and make you their rival. Paradox... please no more random alliance breaking. At least make them break the royal marriage too. It's annoying when your enemies (especially if they are stronger and bigger) don't help you or hinder your development. I'm playing as Manchu and Ming, the only border confucian country near my vicinity, broke my alliance. Now, I have rivals with Japan, Ming, and (they have Mongol Khanate as a vassal) Oriat Horde. Please Paradox please... for the Manchurian children.