The last few comments here regarding the cheating is interesting though I would like to debunk some assumptions and make things more clear for those who want to know the point behind each route (Also for those who have yet to understand the different routes)
There are 3 major routes in the game,
1) The Cuck Route focuses on the sharing aspect of course. So here as you already know the two major sub-paths are Alpha and Beta. You either take control and choose who gets to share your girl or you just helplessly watch others having a bite of your girl. But these two subpaths will eventually again branch out before leading to multiple endings. Let's keep it that for later now. But note that the build-up in this path is less and things get hot quick because her boyfriend is being very supportive and Bella personally wants to become a celebrity and push her limits. There is little to no reason or guilt that can possibly hold her back here. Everything she has to do or "learn" is for the sake of her career.
2) The Cheating Route - In other words the Netorare route. At first it takes a back seat in the lewd aspect but focuses on the corruption buildup. Which means do not expect sex or anything too lewd to happen in the initial stage of the route. But as the corruption builds up (depending on your choices) things can get dangerous and hot.
The two main sub-paths of this route are Trusting and Controlling. As evident by the name, each Trusting choice helps you maintain the love and trust you originally had with your girl. So just think it reinforces her love for you, increasing trust points.
But if you are controlling, you are pushing her away from you by making her feel suffocated and not understanding her as evident by the choices.
Now those who wants to see only ntr will keep choosing the controlling choices. But those who want to balance or lessen the corruption, they could choose the Trusting choices here and there.
So based on these points, it could lead to multiple endings but it never will connect or lead to Cuck or Loyal routes. They are a separate major route of their own with their own endings and sub-routes.
You also don't get to choose who she cheats with in this major route because Netorare is supposed to be bleak and dark where the worst CAN happen. Everyone is out to corrupt and get your girl.
3) The Loyal Route is where the MC's loyalty is tested with the introduction of a new fmc. This route doesn't really need much explanation I believe.
I hope this clears up any confusion