I think the end of Gundam SEED Destiny, more specifically in Final Plus, really shows that even though AsuMey has its
chance, in the "end" if there is a GS3, Athrun will stay with Cagalli.
Four main points that bring this to mind:
1 - The opening sequences that came before the Vestige opening theme. Athrun and Cagalli looking at one another, then
Athrun pulling her into a hug. If you analyze Cagalli's expression, she's first in shock, then her eyes become
downcast, as if hugging Athrun for the "last time", not knowing whether she would ever see him again.
2 - Onto the opening theme with the LacusxKira ribbons a-la Sailor Moon scene where Cagalli and Athrun's figures
are shown reaching out for one another. Their hands finally touch in a gentle movement. Meyrin is only shown in the
"Athrun's Girls" scene, while Cagalli and Athrun are also featured in the "soldier off to
fight the war" scene.
3 - Ending sequence when "Kimi Wa Boku Ni Niteiru" begins. Shinn and Luna go off together side by side, Lacus
has her head on Kira's shoulder, yet Meyrin is walking -behind- Athrun while Athrun is in one of his angsty/emo
brooding states of mind. If they were romantically involved, one would think Meyrin would also be side by side, but
during the final sequence, no such luck for AsuMey supporters.
4 - Interactions post-memorial scene, when the credits are rolling. Lots of Athrun, Lacus, Kira, and Cagalli
interactions, none from anyone else. Focus of the series anyone?
With such a strong showing for those four characters, it makes it hard for anyone else to take center stage. While
Destiny started off as Shinn's show, it became a Kira and Athrun (well, mostly Kira) one-man-show.
While some would believe that AsuMey has its possibilities, and like any relationship, does *dear eff, how forced -can-
you make ShinxLuna?! Wow...*, I honestly don't see it. Outlining throughout the entire series was Athrun's
determination to fight to try and make Cagalli's life easier (why else would he go up to PLANT in the first place
if he didn't care for her) though he did start fighting ORB soldiers and only after a Kira smackdown did he
"realize the truth" about Dullindal.