I think you need to pay attention to the game a bit more.
1. She doesn't she mentions him frequently throughout the game, it is her element.
2. That's because of the devolopment of Squall's character - He has bigger things on his mind, than some petty fued, It also shows the difference between him and Seifer - Squall has got better but Seifer has not.
3. That's kinda the point, he's gone so far into Ultimecia's plans that he has lost the plot and needs to be brought back to normallity, that's what the whole thing with his "Pose" was for.