Yes, and no, I make it a point in the game to say things like "Don't expect me to change that much." etc... Am I more of a giving person than I used to be before I got sober yes. Have my views on sexual preference or what I would and won't want in a sexual romantic relationship changed, no. I don't see a reason for Lydia's to. Of all the girls that have endings (and most will) you will have the choice to get their ending, if you have points with them. Yes you can have a Lydia Solo ending, how this is going to come about I'm not going to tell you, but there will be a choice for it, I promise! You can have a Barb or Audrey solo ending etc etc...
I would suggest playing the game Melody, it's completed, if you haven't. Also Life with Mary. My game is a hybrid of those in the dating structure. (Didn't plan it that way, just how it turned out).
Use the PDF walkthrough, start a new save, only get points with Lydia, Lie to Mary at the Mall (It's all in the walkthrough). Audrey is the only exception up until what happened the last time you were intimate with her. This time you're gonna have to have enough points, that's just the way it is. I'm not going to break off paths, you will still see all the girls, you just will or will not have sex with them."
Unless everyone wants updates where they see about 20 min worth of content with whatever girl they choose, and if I put that to a vote, it would fail miserably. So, you have the option like I said to not get points with them. The PDF is your best friend.