You could try FAVOR (which is made by the same creator as this game), The Kid at the Back, 14 Days with you (these are popular so u might've already played them?) Recently new but good ones are To Train with a Killer, Titan Arum, Velvet bite softly with teeth, and Sacrarium Gelus
OO SUREE, not all are quite good quality or completed but they are in the genre of yandere:
Infatuation by AspenGlen: its a game made from a wattpad story, its completed with atleast 4 or so hours of completion if you read slow (I enjoyed it a bunch^^)
link: Infatuation by AspenGlen (itch.io)
My boyfriend by NUU-pro: it's like ybf but instead your the yandere in short, theres only a day 1 rn
link: MY BOYFRIEND by NUU-Pro (itch.io)
MONSTER X MEDIATOR by HeadLocker: THIS ONES PRTTY POPULAR SO YOU MIGHT HAVE PLAYED IT but in short you are hired to a hotel and all your guests are monsterss
link: MONSTER X MEDIATOR by HeadLocker (itch.io)
Yandere Island by Mari0w0: its pretty self-explanatory by the title, but its about your boat being struck by a rogue wave and you end up stranded on an island but your not alone
link: Yandere Island by Mari0w0 (itch.io)
do not kill me jacob!! by boredbradley: this the is second/extra part of the previous ver, they're both technically the same the newer ver just had more content. you don't need to really play the first one tbh.
in this you are part of a band and you need something for it so you sneak into your friends neighbors house and get taken by him and held captive until further notice. (hes a goat man btw !! incase your looking for just humans skip thiss lmao)
link: Do Not Kill Me Jacob!! Extra by boredbradley, Very_Bixarre, soundskies (itch.io)
The stranger from the bus stop by Daijubudef: you meet a creepy cute guy at the bus stop ^^
link: The stranger from the bus stop by Daijubudef (itch.io)
Splendors halls by Roseworks: this ones a fanmade game of the splendor man, they have a whole bunch of games about the splendor brothers.
this game the other branches aren't specifically romance? but this one kinda has a suggestive ending ig? PS. this one lags a lot if you have a laptop like me (windows 11)
[edit: this games also not rlly yandere?? but he doesn't want you to leave and if you squint theres some yandere romance in there ^^]
Infectious Doctor by badmedicinegames: It is a game about you tryna visit your grandma and getting lost, your knock on a strangers door and pass out only for them to tell you that they're a doctor and you have an infectious disease and you can't leave
link: Infectious Doctor by badmedicinegames (itch.io)
Escape the Slender forest by bloodflow: this ones like 5 or so years old so its kinda bad quality and I haven't personally played it yet so I can't say if it has romance of not but it does look pretty fun so I had to include it
link: Escape the Slender forest by bloodflow (itch.io)
Hello my name is Zach! by Wandering Light Studios: is a short game and the premise is you meet a weird guy in an alleyway as hes dragging a dead body
link: Hello! My Name is Zack by Wandering Starlight Studio (itch.io)
watching the watcher by Apri: after a traumatizing event you abandon your old life and leaving behind old friends to start anew, things start looking good for you but no one can escape they're past (don't rlly know a good way to explain this so I just used a lil bit of the desc)
link: Watching The Watcher by Apri (itch.io)
to eat a god by soffis_mbm: It a demo with three characters all in the theme of religion in some sorts, you have to try to unlock some dialogs to start playing (just start this game so I don't exactly know how to explain yet sorry)
link: To eat a god by Soffis_mbm (itch.io)
horror romance by alegotic twelve: I added this b4 but I removed it because it isn't exactly yandere tbh but the game is about you going on a date with horror movie characters so why not?
the games chars consist of ghostface, jason, micheal, freddy krueger, chucky
link: HORROR/ROMANCE a slasher dating simulator by alegotic-twelve (itch.io)
That's all I can find in my weird list of bookmarked games but I do have some romance novels non horror and interactive fics if you'd ever want a rec ^^
EDIT: (I found a few more but im feeling kinda lazy to put them in buttt you could msg me or reply if you want more lmaoo ^^)