We want to redo Jacky's NTR trigger but currently it's set at the start of the game the first time you go to class and talk to Matt.Hey, thank you, I was afraid that it was that.... I do not mind NTS and certain types of NTR, but I didn't like how that event with the photoshoot played out, so I went to a save before the "blackmail" event in mom's office, but I was afraid I had messed up letting Matt help at the very beginning.
I am guessing that if I allow the photoshoot to take place with Matt, then everything turns even more into that type of NTR where she will always demean you and do stuff with others instead of you?
Originally, Matt was going to be more of a buddy that you'd share girls with but when writing Lauren's update we changed him to an antagonist.
But to answer your question, yes. Matt will become more and more of a jerk and Jacky will fall more and more for him as you progress the story.
To avoid that, you'll have to start over I'm afraid.