That's a really good question.  Why offer it and then reject the acceptance of the offer?  It sounds like one of those annoying bugs.

The answer to your second question is that you were probably attacking a Vasari planet where the enemy had hanger bays in the gravity well.  If you look at the Vasari "Fortification" tech tree you will see a Level 4 ability called "Phasic Trap".  It's something that can be researched and put on a hanger.

This ability combined with multiple strategically placed hangers makes Vasari one of the best races for being able to "hole up" and defend a key planet (chokepoint or home planet) because it could potentially completely counter an enemy's bomber spam, preventing him from killing your defending starbase.  If there are enough hangers the enemy bomber swarm could be completely frozen with one phasic trap ability activating after the other.

Knowing that, a TEC human player in online multiplayer would just build lots of Orgovs to knock it down.  Advent could try to tank the starbase with a very large and properly constructed battle ball or perhaps attack the hangers from long range with starfish.  Vasari might try building its own starbase in that gravity well, far away from the repair bays, forcing the enemy starbase to move out from behind the safety of the hangers.  Non-TEC AI probably doesn't have any programming for how to deal with something that.  TEC AI will actually build Orgovs.

Okay, I suspected something like that.  Thanks for the clarification!

So even though the AI is offering the pact, I still need to improve my diplo performance before I can accept it?

Thanks guys!

each pact has a set amount of relationship and yours has no bearing on theirs and vis versa. if that number should drop some how, you fail a mission, you turn on them, an envoy is destroyed, when the number drops the pact is broken once it's below the required number, if he offered the pacts and then the amount dropped BEFORE you accepted, the offer still stands till you accept it, with the AI they just offer it once that number hits and forget it till you accept to cancel, it's the same with cease fires and visions. so as long as the relationship is up you can accept and offer pacts,(Advent/Tec is a good pact combo), and that's all I got on the subject. If you allow diplomatic victory you win too fast to even play is the only other thing I have on the subject lol.

                  Tune~

Well FYI, a two year old thread is not the best place to ask a question.

But yes is that you both need to have the required relationship status (a change in the latest patch of Diplomacy that's still in Rebellion). You sending envoys to him makes him like you more, but he needs to return the favor before you can like him enough.