>>58519840
Yes but this is also reflective of Ruby's mentally ill obsessions. Interestingly, the FRLG postgame summarize his and Sapphire's characters quite well.

>https://m.bulbapedia.bulbagarden.net/wiki/Ruby_(item)
>An exquisitely beautiful gem that has a red glow. It symbolizes passion.

>https://m.bulbapedia.bulbagarden.net/wiki/Sapphire_(item)
>An exquisitely beautiful gem that has a blue glow. It symbolizes honesty.

Ruby's insane obsession can be considered his "passions" gone off the rails. Meanwhile Sapphire's retardation could just be her honesty without enough cynicism (to counter the vulnerable naivety of being 100% honest all the time). Kusaka's very autistic about birthstones and horoscopes so I doubt this is a coincidence.

Basically Ruby's slavery to Sapphire ass would be more extreme than anyone else's, even ours.