hideaki keep coming across cases that says its not worth it to get attached to a persocom (cram school teacher's ex husband, bakery owner's ex wife, the little boy who's the persocom expert, freya, etc)
elda (named chii by hideaki) and freya are made with so much dedication and love by a couple (who cannot conceive a child) that they developed emotions, freya went through her heartbreak and attempted suicide, and it is ultimately up to chii to decide if their ability should be shared or sealed..
at the end, after hideaki and chii meet so many people and hear their stories.. she reached a decision and left hideaki as she realize there are things she cannot do for hideaki as a robot.. yet after she erased her memory data and herself, she is able to feel emotion and teared after hearing hideaki's declaration of love.. and she decide to share the ability. the assassin robots who were sent to destroy her developed emotions as well, with the female assasin blushing at her longtime robot partner.. so they were able to become more than a killing machine thanks to chii, and yuzuki (little boy's creation) was able to realize her wish for minoru and become more than a machine to replace his dead sister with her newly awokened emotions.
so yeah, the story is filled with subtle warnings for hideaki, and he still chose chii after careful deliberation.. and i'm ok with it, because they do love each other in the story, it isn't anything fickle or pre-programmed, i just think of it as a CLAMP idea of love where everybody is able to love freely. besides, the story is more of chii's search for her special someone in "a town of no people".
Even in cardcaptor, there's different stories about love that are different from the usual.
rika's love for sensei was depicted as a pure puppy love that helped her in the fight against the sword card.
nadeshiko, then 16, fell in love with a new teacher, fujita (a clow reed reincarnation), and they married young (sakura's parents)
toya (middle school) fell in love with his teacher, mizuki sensei, who break off their relationship later, when she saw that he will come to love another being, and herself as well (she meets eriol in college, another clow reed reincarnation who retains his memory and later transform himself to a fifth grader to observe sakura/syaoran)
and later he fell in love with a clow card guardian, yue/yukito. toya knew from the start that yukito is not an ordinary person where even sakura/kero-chan didn't notice till much later.
in tsubasa, a mindless puppet created for the sake of destruction was able to develop his feelings for another artificial being through their journey together