So let me break this down a bit because I am interested:
MC realized his obsession with her college life isn't her problem. He was not in a relationship and had no claim on her at that time
This is specifically contraddicted by Lacey, she knew they had a relationship beforehand and MC does too, this is clearly stated by her in a bathroom scene.
She knows she abandoned him and betrayed him, plus her past is ruining them now on more than one occasion.
This is THEIR problem, for Lacey to make amends and to MC to try and digest.
MC saying that it is his problem is a terrible thing to say and counts as a totall devolution of the relationship and MC+Lacey characters.
MC jelousy is unhealthy ONLY when it was directed to people not in a relationship with him, such at the dancing scene with Mia and Anna, maybe understandable but definitely unhealthy, people with broken trust over and over will be jealous and rightfully so, they need time to heal.
Aknowlleding that he is jealous because Lacey keeps on tripping on the simplest things and lies constantly would have been a better direction.
He fixes the problem with Jared and starts to understand that he is actually NOT worthless and that his friends are right
You might be right but only partially, MC proves that even when he gets the director position that he does not aknowledge his sellf worth, this happens after the Jared fiasco (that you have to accept as turboporn logic on some parts, a specific event thay gets sent to Jared phone comes to mind, it wasn't bad per se as a "reward" but...).
he finally starts to make strides to improve her psyche, she starts to recognize that she is incapable of making good decisions because she lives in the moment and never thinks about the negative consequences and knows that she only focuses on the positives. She realizes that she is entirely too trusting and believes everything anyone tells her. She recognizes that her entire life has been about her and that she never once put his feelings as a priority
These things are stated in the first 30-40 minutes of the game, they are true at the beginning and are true at the end.
But her actions NEVER change she is always selfish and NEVER considers MC feelings and emotions up to the bitter end of the act.
We stated that some things are very important to MC, she proceeds to break them over and over up until the end of the act.
Talks about him aving full control many times, then removes it in two specific occasions (video and club at the end).
Lacey is not growing, she never aknowledges that what she does is because she is addicted to male attention, especially from MC, but from everyone else too.
Remember she copes by lying to herself (she admits to it often), what she tells is 90% garbage.
Maybe she doesn't know why she is doing some things, but she is forcing MC to run at her pace, fulfilling HER needs full knowing that he will do anything she tells him to.
This is an absolute devolution or at best, stagnation.
She recognizes that she loves his jealousy and possessiveness but that she hates the resulting pain that those feelings cause him. All of this starts to happen after Damian, and then even more after the last Isaac situation.
This is true, she admits to it at that point, while it is clear from the start by her actions that this is the case.
Even then, does she stop hurting MC? Pushing him to his limit? Didn't we say that she would take him more into consideration? Builld his trust?
She does the opposite, the Isaac event is a total devolution from whichever we learned from Damian.
"I don't like Damian humiliating my husband" develops into "I will invite the man that humiliated my husband on public tv and internet for a nice cup of coffee".
You see, maybe the author tried to paint some growth, but by looking for the next crisis, he invalidates everything.
Anna devolves as well, she has known the MC for the longest time between all the side characters, she could have been the dam to protect him,
In reality she never does and sides with Lacey and Mia up until the end, aside from one occasion which she promptly nullifies by essentially siding with Lacey on the Isaac event.
I appreciate your point of view, I just cannot really agree with it.