Honestly, I don't think Hizumi not being a virgin is an chronic issue. Obviously, it would be better if both could share their first time with each other, as there's nothing more romantic than sharing that with the person you love and wants to stay till the end of your lives. Unfortunately, she had a bad upbringing. Her parents clearly didn't give her advice on how to handle a romantic relationship. Even so, she's only had one boyfriend, so it's not like she's a promiscuous slut. In a way, she did the best she could with her limited knowledge, but unfortunately, she was cheated on and had to move on.
My problem is, first, the slightly cuckolded way the author portrayed her on top of her ex in an ecchi pose while we, the readers, are rooting for the simp Shinba. Second, it's what she became after being NTRd and how she interacts with Shinba. She humiliates him constantly and then gives him crumbs of affection through this possessive relationship. Let's be honest and recap the context: At first, she used him as nothing more than a rebound to replace her ex or need for love. Shinba is just a copy she designed to substitute her ex, a version 2.0 where she learned the bugs and fixed them. He definitely doesn't deserve this treatment.
Look, I think Hizumi absolutely deserves to be happy, and her parents were horrible, but I don't think she deserves Shinba, mostly because of who he is. He's too good of a guy!
Man, even with the scarf, she knitted one by hand for her ex, but for Shinba, she just recycled the same idea lazily by buying one. Shinba deserves someone better without a doubt. Hizumi can move on and fix her mistakes, but I think Shinba would be a thousand times better off with his actress childhood friend. Hizumi doesn't need a man, she needs a therapist. After that stage, she can try a >>NEW<< relationship. But we all know that won't happen. Shinba will still be an idiot until the very end and will accept all her flaws like the simp he is, after all, this work is pure self-insert from the author.
Authors know you put yourself in the shoes of the protagonist (Shinba). All the provocative scenes where Hizumi humiliates herself for her ex are meant to make you uncomfortable, just like Berserk and the infamous Eclipse scene did for example. Here, it’s no different. The author >pseudo-cuckolded< this story by showing her intimate scene with her ex. I really miss when this manga was lighter. The drama has become WAAAAY too over-the-top, and the ending won't be satisfying in my opinion... it's actually pretty predictable.
I don't like reading romcoms with overly exaggerated dramas, mainly because of the abrupt shifts in tone between 'comedy' with chibi faces, and heavy 'dramatic' chapters like this one. The script structure becomes a Frankenstein's monster in my opinion...
That being said, I'll go back to my peak romcom BokuYaba now.