Different flavors and intensity of dark, off the top of my head: Itou-san ANYTHING and everything by Asada Nemui Atokata Heartless by Nishin Masumi Yatamomo To Kill the Crows of 3000 Worlds Bi no Isu / Kobi no Kyoujin MADK Momo to Manji The Inheritance of Aroma Despicable
I'm an older person, but when I was younger I didn't even know that not getting married or having kids was an option, it's just kind of what people do, so I went with the flow. I felt like in my relationships I didn't really feel what I was supposed to, but more like my satisfaction came from the validation of having someone think I was special and......
guys, if you want another story similar to this, i highly recommend this one!: https://www.mangago.me/read-manga/500_nen_no_itonami/
Whats one dark romance bl you actually think is well written??