"Super Dimension Fortress Macross" and "Macross Plus" (romantic themes set against an action or space opera backdrop). Also "Cowboy Bebop" (the former Spike-Julia romance, and the fact that he's still pining for her, set the theme for the entire series).
Here is what i think is a sad romance:
1. air
2.h20 footprints in the sand
3.clannad the after story
4.myself,yourself
they all made me cry and had me say why