You are always free to say, "no" or to pick other dialogue choices making clear your intent to keep things on the 'friend' level instead of romantic.
Some want more, some want less, some want none. Can't keep everyone happy - personally I think they got it just right for the vast majority of those that will play the game.
You are of course free to hold your own opinions, but calling this game-breaking is a bit overstating the issue. You can always say, "no".
