FMC finds out MMC is rich and feels betrayed

Hey everyone!

I'm looking for a romance book where the FMC finds out that MMC is secretly rich, and she feels betrayed by this. Maybe because she was hurt by them in the past or she just felt betrayed for the MMC hiding a part of himself. I would love if FMC is down on her luck and MMC wants to take care of her but has to come up with creative explanations for where he got the money from.

I am open to both CR and HR. But no cheating, love triangle or RH please. Thank you!!