Is it possible

This is a goldmine. Thank you.

youtube.com/watch?v=VlW4jYvYRNE

yea, i imagine that's how it'd be. only that relathionship would last anywhere from a cheap fling, to a few centuries.

Yes, but not quite in the same way as humans do. Aside from eldar feeling all emotions far mor strongly than humans, DE are extremely selfish and possessive so their idea of love is more about wanting to own the object of their love. The closest equivalent to a declaration of love among the DE literally translates to "I willingly submit myself to you".

sociopathworld.com/2009/01/do-sociopaths-love.html was a rather flowery description that fits reasonably closely with how DE love works in my mind.

they might also have a super jealous/possessive relationship where they both view each other as their property due to how devoted they are.

DE woman owns her husband
DE man owns his wife
the sex would be insanely set up around making the other feel better

yea, that article also matches up with my one ex perfectly.

Hardcore BDSM. Only without and safe and sane part. And even the consent is kinda dubious. . .

Yandere is more from the lack of understanding or feeling love, more for nids or if straight up crazy, chaos.

DEldar are either yandere or cuddly bubbly under closed doors.

Perfect

Yes, though they wouldn't show such weakness to their rivals.

...