Actually, you do have the "choice" to drop her. If you pick anything other then "only girls" she loses interest on you and her questline ends completely. I'm not saying the logic fork here makes that much sense, nor that this was the best way to go in my opinion, but hey, it's the dev's game, we play because we want and most of us for free.
Now, let me correct you on a detail. Laura does not cuck you. You have an open relation, you can have who you want and she can have who she wants (and she even accepts a limitation on only girls while you still get to have fun with trans and Jason if you like that). Actually, if she has a girl and knows you're nearby, she brings you in. The times you see her with another girl and doesn't get involved, you are spying them, she doesn't even know you're there. And she is not rubbing on you when she has fun with her girls (because that is what "cickolding" is). I still would rather to not have that part when she makes a lot of jokes about you and aunt but whatever, we get get over it.
Buuuuut if you are too jealous to have fun with a game that involves sex in the story, drop on Laura, you can do that.