Everyone Knows They're in a Relationship But Her

Looking for book recommendations where the FMC is the only one who doesn't realize she's in a relationship. The premise is that everyone and their mother knows they're a couple, but the FMC is clueless. Meanwhile, the MMC is completely obsessed with her, and they do everything couples do: go on "dates," hang out at each other's places, cuddle, and generally act like they're in a relationship.

Books I've read that comes to mind: \ {Not So Nice Guy by R.S. Grey} The FMC and MMC are best friends and teach at the same high school. Everyone assumes they're in a relationship, MMC is fully aware of this and never denies the speculation.

{Trust by Jana Aston} The FMC is anxious about going on dates & being in a relationship, so the MMC asks her out under the guise of it being a "fake date" or "for a favor".

Not really looking for fake dating dynamics where only one of the MCs thinks it's real — more so the FMC thinking they're friends, and everyone around them knows otherwise. But any recommendations are welcomed, thank you in advanced!