Why is everyone talking about a love triangle? Ros is obviously Eros and the King doesn't ...

Ros is not Eros, he's a different person. It's been already debunked by a certain chapter, Ros was harrased by two men, Eros is not stupid enough to suddenly approach Psyche with a disguise, he's actually watching Psyche the whole time the harrassment happened, he followed the two men and have them murder each other while Psyche and Ros gets to have a romantic moment, Ros could be Eros' brother "Anteros" or basically just a normal human called "Ros"