DelActivisto
WARG!
That is usually true for most adults, but in YA the characters aren't necessarily well-versed in matters of love--they aren't old enough to have lived through several significant relationships. The love triangle makes more sense in YA than it does outside that subgenre IMO.
I dunno, seems like in high school kids gain and drop relationships as fast as video games. I think the main point is that the love triangle has simply been overdone. But I do also find it unrealistic. So I don't see it being helpful for so much YA to contain it, convincing teens that it's normal, when it's not. What is the utility with that?