FMC Quietly Disappears and MMC Goes Nuts

I'm in the mood for books where FMC disappears without telling anyone, or she gets abducted, and MMC goes crazy when he realizes she's gone. I want to see and feel MMC's angst, not just have the book skip over to when they find each other.

Bonus points (but not required):

• FMC was rejected/heartbroken/betrayed by MMC before her disappearance, or her love for MMC was unrequited
• FMC doesn't think anyone will come looking for her

HEA only please.

I am cool with MF, MM, and reverse harem.

Any subgenre of romance is good (including dark romance).