They broke up...?
What?!
Seriously, that's a terrible way to end this... No, it's not even an ending, it's a non-ending!
The story went to all that trouble to get the blond girl and the dark-haired girl together, then it has them break up like it's no big deal, all "what evs yo".
Well, this was certainly a bad ending- a love triangle where everyone gets friendzoned!