Not that any kind of logic or consistency is expected in these types of games but the idea of him 'winning her back' seems preposterous to me. In the beginning she says she loves him and feels a tiny bit of guilt but that disappears fast and she's quick to jump on other dicks. Just because she says she feels bad and says she loves him doesn't really mean anything when there's no hesitation to cheat on him. She's made it clear he can't satisfy her and she blames him for a lot of what's going wrong in her life and at this point in the game seems to actually resent him. Half the game and half the lewd scenes are basically everyone shitting on the BF and portraying him as incompetent (which he is), it just seems kind of ridiculous to believe he could get her back. I mean let's be real if he does end up forgiving her for screwing everyone they know including his dad, and tries to get her back, it just confirms how pathetic he really is. Will he suddenly grow a bigger dick and become a monster in the sack? She gets betrayed by literally every other person she's slept with and just settles for the BF because she has no one else? The truth is he's only still around (and will be kept around as long as possible) to satisfy the cheating aspect of the game. To satisfy that kink/fetish it has to seem like the cheating actually matters and there may be consequences to it but the truth is there are none. That's why it's hard to imagine any scenario where he wins her back without some majors shifts in characters personality and tone or some heavy duty retcons.
What seems more plausible and maybe fits in with the story better would be a 'revenge' route where he gets back at her and everyone else who betrayed him. Maybe he takes over all the gang operations and makes her his slave or whores her out or maybe he goes nuts and kills everyone or she genuinely feels remorse after her life hits rock bottom after everyone's used her up and thrown her away. I know it will never happen as it's probably the opposite of what people are looking for but those scenarios feel a little more realistic then the BF winning her back.
I think originally Deep intended for Andrew to be the fall guy in this game. I mean he was set up for it from the beginning. He deliberately made Anna very likeable, and Andrew very unlikeable. That way players wouldn't feel bad about Anna cheating on him with half the city. And it worked, Andrew is universely disliked by the vast majority of players. In fact, he was hated so much, that most patrons wanted him killed off. Which was a problem for Deep, because Andrew's main role in this game, is as you indicated, to be the guy who Anna cheats on.
So Deep decided to have Andrew shot, and placed in coma. So that he was effectively out of the picture, but still actually in the game. At that stage, I don't think there was any plan for Andrew to have a 'renaissance'. He was either going to be dumped by Anna, when he recovered, or he was never going to recover at all, and killed off like Jeremy.
What changed was Awake becoming Deep's collaborator in the game. He persuaded Deep to give Andrew a chance to eventually win back Anna. He reckons he has a plausible way for this to happen, but he's so far not elaborated what that might be. I don't know whether they've categorically decided to do this yet, but they are seriously considering it.
I personally, am not a big fan of Andrew. But if they decide to give him a route, well I'll definitely be playing it, even though I'll probably get greater pleasure from the routes where he gets dumped.
My guess is, that to be on Andrew's route, Anna will not have to have a high corruption score. She'll have to have the operation to cure her condition, and the player may also have to make future choices that will lower her corruption score. I assume on this route, it will be explained to him that his girlfriend's cheating is partly a consequence of her 'condition', and Andrew will have to forgive her. Maybe also, he'll have to be open to a different kind of sex life than he was in the past. Perhaps, threesomes with girls or even swinging?
But all of this, is a long way off. At the present rate of progress, it's going to be about a week in game time ( approx 10-12 updates, and probably at least 2 years in real time) till Andrew wakes up, and Anna can question him about Rebecca's Kidnapping. And then at least another week till she makes a final decision ( so another 2 years).