It's hard to feel sorry for Miyuki considering Eiji would have been in a worse position if the world forsaken him.
Purposely falsely accusing him as an abusive Boyfriend because she was afraid of being seen as a bad girl sealed her fate.
No one is feeling sorry for her, she fucked up due to hubris and selfishness. She made decisions that blew up out of proportions and kept making terrible decisions each time she came at a crossroad. She said it herself, she thought she could just throw him under the bus until all the attention blows over and she moves on from Kondo then they will be back together as if nothing happened. It doesn't help that the story is not well-written, logically the sequence of events is nonsensical and the actions/reactions of characters is way over the top. May work for the sake of drama but it's very farcical.
The point is that Miyuki's comeuppance feels entirely disproportionate. Now, I don't know what it is she deserves for what she did but it feels like we kinda went over a spot that most would consider reasonable. She is absolutely a punching bag, but how much more can she take? How much more should she take? If the story and characters were less clownish, we could have a proper talk about it but unfortunately it's not.
Kondo got exposed as a "homewrecker", tanked his team, got beat up by them for his bullshit, and I believe is now sitting in jail with his dad who is responsible for Ai's mom dying because corrupt politician. Reminded that Kondo is a teenager whose motivation is that he "likes to mess with people's relationships". How ridiculous is that?
Then you have the random girl who turns out to be the mastermind behind it all, she orchestrates things such that the girls she do not like or who overshadow her end up becoming Kondo's sex pets and that the otaku ex of one of those girls has been also masteminding behind the scenes to expose all of that just as it was happening to Eiji. How stupid is that as a line of thought?
Then we have weird character's moments,for example Eiji's mom being aware that Miyuki is cheating on him but she only uses that information to berate her. Aren't the two families very close? How come she let what is essentially a daughter of hers go down this path without telling her mom, only to throw it in her face when she gets the chance?
Or Miyuki herself being this chill with cheating when her father abandoned her mom for another woman, like what?
So yeah, fuck Miyuki, but also, what are you saying with her character at this point?