The only girl who actually wants the MC is Mira. She's a simp for the MC. Plus, she was a virgin, until the MC.
There's a case to be made that Mira really doesn't want the MC either, as much as she's repeating the exact same mistakes Naomi did.
She's chronically shy and insecure, has (in her own words) moved multiple times (making it hard to have friends), and seems desperate for love. As presented, she's not really in love with the MC at all - she's in love with the
idea of being in love with the MC. Other than Damon, MC is apparently the first guy who's ever really shown interest in her, and unlike Damon (who pretty much ditched her after he'd passed her off to the MC) he's continued to show interest and generally be supportive (assuming you're following her romance path).
You're basically fulfilling the traditional childhood fantasy of a prince coming along to rescue the tragic girl from her sad life. Her self-esteem is in the toilet, and the fact that
anyone would show interest in her at all is probably more than enough to trigger obsessive affection vibes. If some other guy had come along and complimented her painting first, there's a good chance she would have wound up head over heels in love with
him instead - there's nothing inherent in the MC himself that she's actually fallen in love with (and honestly, what does she even really know about him at this point, other than the fact that he's hung up on his ex and he keeps being nice to her?). He's
convenient, and
comfortable.
Which might sound like enough for a solid relationship, but really, it's just another form of co-dependency. And it's probably going to go bad fast if/when they eventually have a fight about something, or she grows up a little and realizes how little they have in common, or she catches him with multiple other woman and starts to question whether or not he ever really cared at all, or if he was just playing her (at which point, she's probably going to regret giving up her virginity so easily/quickly).
And if some guy comes along who is equally attentive and affectionate but who also shares some actual interests with her, it's entirely possible she may find herself redirecting her "love" elsewhere. An MC in a relationship with Mira better hope she never meets a friendly cute dude in one of her art classes.
So a child, then an adolescent, then a teenage girl, who has lost everything and everyone has a hard time assimilating into a family (assuming the most supportive chain of foster parents) and you think that your assumptions with regard to her behavior justifies all but the last set tossing her aside because of their difficulties dealing with her?
Yes. Because she's no longer a child at this point, and there eventually comes a time when you have to start taking responsibility for your own actions no matter how terrible or broken your childhood might have been. Understanding WHY someone is broken doesn't really change the fact that they ARE broken, or that they may be the root cause of many of their own problems
because they're broken.
To quote from an old and very, very good story:
"
There is always a reason. Whenever anything has been mucked up, whenever anything outrageous happens, there is a reason for it. You still have a mucked-up, outrageous situation on your hands, however, and explaining it does not alleviate it one bit. If someone does something really rotten, there is a reason for it. Learn it, if you care, and you learn why he is a son of a bitch. The fact is the thing that remains, though."
We have literally no idea what her prior families were like or why they eventually let her go. We have nothing but her own perspective on things (which may be radically wrong and somewhat self-serving). But what we
have seen is that in the precisely two situations where she's arguably been "abandoned" in recent memory, she's been complicit in what happened herself. It's not a case of her simply being tossed away no matter how hard she tries to hold on, she's either passively allowing it or actively pushing away herself. Yes, that may have evolved as a defense mechanism against being hurt, but when your strategy for coping is to push people away before they can abandon you, you start turning abandonment into a self-fulfilling prophecy. Even the most understanding of people are going to stop reaching out to you if you keep slapping their hands away.
But ultimately, we're talking about a fictional character who doesn't actually HAVE a backstory, and who exists solely to further a plot, so there's only so far we can take this discussion anyway, because there's really no prior history we can point to outside of how she's presented in-game to justify or dismiss anything she does. So at the end of the day it's always going to be a question of perspective.