Has Japan never heard of bros before hoes?
I can only think of 1 manga where this trope completely subverted: Ore Monogatari!!. The lifelong friend is even friends with both of them, and occasionally even spends time alone with the heroine without developing romantic feelings (you know, like a normal person).
Edit: On a side note, I think the heroine handled it well in Saruyama.
Spoiler (mouse over to view)
"You're only interested in me because I'm your best friend's girlfriend", "I can only think of you as connected to my boyfriend. Without that connection you're nothing to me."
Seriously, you don't see many heroines who can actually reject people. Last edited by Rozzak at 1:49 pm, Aug 15 2016