Looks more like a side couple with a side order of lingering resentment than a triangle of any sort.
Gotta be annoying for Yae. "What would change if I cut my hair and was more boyish?" "Oh, apparently I would have gotten to date my first love and spared myself some early heartbreak, because it isn't that she wasn't into girls, it's just that she likes the boyish type."
Still, Yae is exceptionally not boyish, so I don't think she could've pulled it off anyway, and Chitose loves her for who she is.
I'm 100% not worried about this development.