You just don't understand them
Oh I understand them, alright...scheming, dishonest, backstabbing S.O.B.'s Never, ever, trust a Greek faction. People like to comment that the Romans are never to be trusted...and that's true. But....

....the Greeks have backstabbing down to an art. I had a Carthage campaign awhile back where it seemed convenient to keep them around. I figured to use them as a temporary buffer against the Romans until I had completed my campaigning elsewhere. I gave them a couple of cities, some cash, and granted movement rights through my provinces so they could get from one to another of their split holdings without having to stop next to one of my cities. All well and good. They behaved themselves quite remarkably for perhaps a decade, and were actually doing what I had set them up to do....keep the Romans occupied for awhile.

When the backstab came, I guess I wasn't too surprised but what pissed me off even more was the way it was done. Not in a warrior act of courage by besieging a city, but a little chicken$%#@ port blockade by a single bireme that ran away the following turn. Needless to say, you can guess what happened next