It is what it is. It's not changing. It's the way it has been since the start.
You can be locked on friends path with anyone, but the dialogue and actions will mostly play out like you are not. Every girl IS going to act like they are with you. Lewd scenes and some dialogue will be skipped automatically but not all of it. This is so Buu can still put out monthly updates without having to add in all the branching that would be required for all the possible combinations that players may choose.
I didn't like it, but I have learnt to live with it, because I like the AVN, the story and most of the girls. I do multiple paths including solos and I can laugh about some of the things said now. But if you can't live with it, it is not going to change, there WILL be dialogue indicating you are with a certain girl when you are not. You will be much better off, deleting the game, ignoring the thread and moving on to something that suits you.
This was not aimed at you guys in particular, but as someone who has been playing since the beginning, this complaint has been around a long time and rehashed over and over on just about every page.