Does difficulty level affect diplomacy?

Does the difficulty level affect diplomacy? I'm playing a game as the Germans, and I started off gaining an alliance with the Gauls and Britons, but they both betrayed me, and Dacia attacked me, and Rome won't give me the time of day. I'm playing on Very Hard, and I'm wondering if my early alliances might have held up better or a different difficulty setting. I'm currently being attacked from all sides, and with Germania being spread out as it is (and I conquered a lot of Rebel provinces early) it's near impossible to get an army in every area that I'm being attacked. Egads!

Ive found it hard to ally with anybody that i share a border with on VH. But playing as the Seleucids the Germans wouldnt ally with me. They seem more inclined to ally if they are down to one province. But having mutual enemies doesnt seem to affect the Ai routines.

I dont know but useful alliances on VH are kinda hard to make.

I am not an expert, but in my opinion it's best not to ally with your neighbor faction, but make an alliance with neighbor's neighbor (if that's possible of course). That way, you have 2 benefits: you're not afraid of betrayal, because if it happens, the enemy will leave their back front weakened (just make sure you have good fortified defences on your borders ~D ); the next thing is you can crush your neighbor on two fronts. I think that is what romans did actually in history. Split and rule! Good luck!