Ok, so I was playing a game as the Lord of Wyl (in Yronwood, in Dorne if you don't know) and I had managed to take control of 3 of the 4 provinces owned by the High lordship of Yronwood. I then declared war on the High Lord of Yronwood for independance, which I won, before usurping his title and then beating him in a war to take is last province. After that, everything was going fine. The Prince of Dorne managed to gain independance from the Iron Throne, creating the Kingdom of Dorne, ruling over Dorne and the Stormlands.
The Prince's daughter took over the rule of the Kingdom when he died and after a few years of her rule, basically all of Dorne rebelled against her. The Stormlands fought on her side but I could see that see had no chance of winning so I decided I should get on the good side of the victors and joined in the rebellion. Before long we won the war and a new Prince took the throne of Dorne. Almost immediately, despite helping him in the war, he sent me a message revoking one of my titles. I decided to give it up, since I could probably win it back later. Then a while later, he sent me another message asking me to revoke a second province, which again I accepted. Finally he sent me a third message, leaving me with one province before I realised he had kept all three provinces for himself so there was little chance of me taking them back.
Basically I want to know was there any reasoning behind this or is he just a greedy bastard and decided to pick on me?