What up wit dat Fall 1905

Yet more bounces.

But at about this time, I knew what I needed to do: Get an army into Greece so I could take Serbia without hassle.

I decided to reach out to Austria:

Firstly, let me apologize for the slight stab, as I'm sure you're aware, I was grasping for straws and I needed some supply centers back. You were the strongest neighbor I had and the biggest threat to my survival. 
Now things look a bit different. You have 3 out of 4 of your neighbors attacking you (not even including England in this - don't know what your relationship with him is). 
If you take your unit out of Serbia and use that to attack Trieste, your home SP, I will take Serbia but no longer attack you nor support Russia and will instead concentrate on Italy with your help. 

My thinking was that we needed each other here as he was overrun with enemies - but he needed me more than I needed him. His response:

Please do not treat me like a fool.
I offered you the hand of friendship and you bit it.
I gave you a way out of your current situation and you stabbed me for short term gains.
If you are serious you will have to come up with a better plan than me giving away my SC's for no benefit to Austria. 

Well it's his loss - he'll be gone in a few turns and I'll have a piece of his pie. If I was him, I'd have swallowed my pride and took it.