There's already been cases ingame of your spouse getting jealous if you give other marriage candidates gifts (though I feel that should have been toggled a bit. Elliott, calm your tits, it's Alex's birthday) and when you get your fortune told while you're keeping everyone's heart levels perfectly even (and you may need to be dating all the candidates?) the fortune teller mentions you may end up breaking a few hearts by not choosing one.
There's always been a nudge and nod that you really should make up your mind, don't be selfish, and pick one.
This is just more in-your-face than what we already had in the game.