They disappear because it is obvious they were “shoehorned” into the storyline and and were a token character to begin with.
Just how many shows are written around a character’s sexual choice of partners?
Don’t remember any NYPD variants dealing with their sex lives and the Walking Deal shows had a few but added nothing to the storyline other than to p.o. regular viewers.
What makes me really ticked off is when they take a character that has been straight for several seasons and, out of the blue, make them gay or trans.