I rather had something similar to that before, and the only thing that ever worked was asking that person just to be friends again, and starting building a romantic relationship all over again. Also, whenever I have specifically trying to modify a relationship I "pause" the game, then click through multiple pages of possible queries/answers before unpausing and choosing one.
I commiserate with you fully because I totally hate when the option I am looking for never appears again because I clicked through or missed it somehow.
