My memory is not too clear, so i might have gotten a few part of the story wrong since it has been a long time since i read this.

Pretty sure it was a oneshot (or a very short story containing few chapters)
What i remember was that the guy pretended to be deeply in love with the girl, acting all shy, blushing..
While he was really a huge playboy wanting to get laid.

In the end the female lead found out she got played by him after completely fallen for him, and turns complete into yandere mode & dominates him.
That's the end of the story.

Would love if someone helped me find it.

It's probably not this one since it's still ongoing, but that sounds exactly like Gachi Koi Nenchakujuu.

Ah it isn't but thanks anyway. 🙂

Btw just going to add some info, maybe someone might get an idea.

The female lead wasn't in love with male lead at the start, she was very cold and acted pretty emotionless, so it was surprising twist when the cute male lead who acted all blushy and shy around her never fell for her in the first place, while she completely fell for him on the other hand in the end.