Is she Love or Ai?
And whom Setsuna became after all?
And why the hell couldnt she become someone better while Love's side? @_@
Women. Sometimes you just dont get them

Ahh, that was what I needed after finishing the series! I'm glad the author had EXACTLY the same feelings about the end. And good work from the translation brigade; some nice flourishes there. Was the "You're my goddess." bit direct from the original or a gloss of another phrase? Regardless, I approve.

Is she Love or Ai?

ラブ. There's an episode where it comes up exactly why, even.

And why the hell couldnt she become someone better while Love's side? @_@

Because a major theme of PreCure is following through on your hopes and dreams.

Women. Sometimes you just dont get them

This makes a bit more sense if you've seen Fresh.

This is great. The author's sentiments align with my own as the end of Fresh felt...odd. Like it wasn't a bad end but everyone just went on with their lives as if this epic saga never happened or like its another normal day. I know there are movies that sorta formulates "endings" with cross overs but Fresh itself needed...closure? This dj is it. Except more would be better. Much much more.

As for the questions...

Yes, her name is Love. It sounds weird to say "I love you Love" but episode 28 explains it.

Setsuna has always felt guilty about the negative things she have done. This is speculation but she probably didn't feel that she had the right to be happy at Love's side when her home world needed her help/guidance. Also, she is Cure Passion, stated to be the most empathetic of the group, so she wanted to (needed to) help her home world rebuild.

Women, men, children, animals, and electronics... they all get confusing and frustrating at times.

https://dynasty-scans.com/chapters/the_future_you#13

Here ya go. The Setsuna you bought from Amazon is now delivered in your room this very second. Have a good day.

What a beautiful story that is so deep and profound!! Love and Setsuna are both trying their hardest to bring smiles to all beings they encounter! Before the story ends, they are together again!!

Oh man, this almost made me cry. The author nailed LoveSetsu here, Love and Setsuna's voices both shine through so strongly.