I don't know, to me it just seems that because he was being attacked back, he left. He's just childish. He's saying that because Gervassen was stronger than him, there was nothing he could do, yet he was rolling over me, and the only things I could do to slow him were the cheap tricks he was doing when I first sent him soldiers (dropping one soldier just after a battle, etc).
And yet when he 'bullied' me, I didn't snapped. I think it's the same case as Silverfire "I want to be the big empire everyone obeys, but if someone attack me, I'll cry because he cheated, when I used the same tricks or didn't considered there could be people allying against me".
Also, I hope that with a bigger map, an alliance like us wouldn't be big enough. Maybe we would control a part of the continent, but nearly half ? I doubt it, we're not enough, at best we would have to ally with other alliances, and I think that's the point of the game. And I hope players will be better, because honestly, I don't care being the vassal or the liege (as he's saying), it's not really what I find interesting. My title (vassal, barony, etc) doesn't matter to me, it's more the actions in the region I'm controlling, shaping up my little piece of land, etc. The war I had was interesting, even if I was on the losing side at first. Now what he did was just childish. "I want to bully smaller realms, but I don't want to be bullied."
Edit : About Celestial, I don't think I'll grab any land. I have enough for my liking, and scrubs are not interesting, I'd rather have 1 grassland than 5 scrubs. I think i'll focus on building and garrisonning as for now. Probably keep my settlements in the mountain though. I will not have much time for the few weeks to come, so yea, not much action.