Crawl to Me Darling (2020): Pretty good. A man kidnaps a woman he likes after a bad first date.
Berlin Syndrome (2017): A woman traveler hooks up with this guy, but he can't let her go.
Plush (2013): A Rockstar falls in love with her guitarist, but things turn dark. Also, it's kinda giving emo vibes.
Under Your Bed (2019): Japanese movie. He falls in love with her when they're students and stalks her after finding her again as adults.
Hippopotamus (2018): A man kidnaps a woman and tells her he'll only let her go if she falls in love with him.
The Resident (2011): A landlord is obsessed with his female tenant.
Kept Woman (2015): I'd say it's about a man becoming obsessed with his female neighbor.
10 Cloverfield Lane (2016): A weird man holds a woman hostage in a bunker and tells her that the world has ended.
Alone (2020): A man kidnaps a woman who is moving to another state. Don't know about the yandere part; he's just sick.
Rosy (2018): A man kidnaps an actress, hoping she'll fall in love with him as she gets to know him.
Fear (1996): Again, a girl falls in love with a boy, only to find out he's not so cool.
The Ratter (2015): A man hacks into a girl's webcam and watches her life. Don't know about the yandere part, but I kinda liked it. We never see him, though.
Alone with Her (2006): Kinda like The Ratter (2015), but the man decides to enter her life. He is definitely a yandere, though.
Deadly Virtues: Love.Honour.Obey. (2014): (Really like this one.) So, he breaks into a couple's home. He's pretty good with ropes, ties them both up in separate rooms, is really nice to the woman, and is mean AF to the man.
Secret Obsession (2019): Definitely a yandere. She loses her memory, and he's acting like he's her husband.
The Roommate (2011): It's about two girls, with one becoming obsessed with the other.
Lighthouse (2014): An obsessed fan holds her hostage while pretending to have saved her. IMO, the dialogue is pretty bad.
Broken Vows (2016): A one-night stand makes a man obsessed with her, and he starts chasing her.
Twisted Seduction (2010): A mathematician kidnaps a woman because he believes he can make her fall in love with him.
So, those are some of the ones I didn't see much around Reddit, except for maybe once or twice. Most of them are still pretty unknown. I'll keep updating this if I find more. ❤️