Evangeline Lilly herself was against there being a love triangle, so much so that it was the sole condition of her accepting the role. As she states in this interview for Yahoo!Movies, there was no trace of a triangle during principle photography. Rather, it was a substantial part of reshoots in 2012, as something that the studio felt needed to be included. What that boardroom discussion looked like is something we can only speculate on, but Lilly does her best to play down the subplot in favor of kicking Orc ass.
Wish She Could Be Part of Your World: On Tauriel-hate and Original Material | The Mary Sue