I'm playing as the Antigonids and the AI factions don't seem to have any diplomatic restraint whatsoever?

They'll sign trade deals with you and then literally the next turn attack you out of absolutely nowhere, faction reputation or relationship be damned. They don't seem to suffer any sort of debuff for breaking treaties and just go after me at literally every turn, even when it's just not a good idea. Twice the enemy has essentially kamikazed itself by attacking my seemingly exposed city only to have my main army that was practically next door, come in, wipe out the invaders then take their capital within two turns.

Add to that the other diplomacy options seem bugged. Bribery just doesn't work at all and ceasefires are considered "very demanding" even when I have their capital under siege. I've had to stop now as Sparta decided to break my alliance with me to attack me (they at least waited 1 turn after breaking the alliance) after giving up on finishing off the Acheaen League who were at their mercy after said League declared war on me (while I was still allies with Sparta). They've declared war even while my main army, currently sieging Olympias, is literally a turn away from the city of Sparta and could capture it in two...