Why are they all trying to get in MY pants? Honestly, I'd expect the ones I leave at camp to be shagging each other out of boredom, especially once Halsin joins the camp.
To avoid FOMO I guess...
I'm not sure if there's some "Point of no return" for initiating romances, after which it'd be a-okay for companions to start getting with each other...
But before then they wouldn't want people to feel they missed out on a relationship because the companion they wanted got with someone else (With the option of being a "Homewrecker" not being appealing)
There's probably the side effect of they wouldn't want to infer canonical pairings, as it'd make people question characters sexualities and legitimacy of "Their" relationship.
Though it's most likely just, games don't write characters properly so they only write in a single romance, which is with your PC.
