not st8 but there is a subgenre of yuri centered around women killing/getting back at their abusive husbands if you'd like any?
https://www.mangago.me/read-manga/let_s_kill_your_husband/
https://www.mangago.me/read-manga/killing_mr_park/
https://www.mangago.me/read-manga/for_garbage/ (not rly but i liked it)
https://www.mangago.me/read-manga/gunjou/
https://www.mangago.me/read-manga/run_away_with_me_girl/ (my fav)
there's a lot more im missin but top of my head this what i got
You mean where one of the main characters is in a relationship and the guy their dating is an abusive asshole so they end up ditching them and fall in love and run away with the other main character? I don't think I've seen a straight manga or webtoon like that, I'm reading a GL like that tho. They might have straight ones like that, I'm not sure

Is there any straight webtoons or manga about dv ?