hopeless romantic society discussion

Hi, I am trying to find a book I read earlier. The mail lead is fascinated by an artist who uses a pseudonym to sell her paintings. The artist turns out to be female lead’s sister who sold their childhood home and stole the female leads painting to sell it. The male lead believes that the artist is his soulmate.
Thank you

I think is "The Casanova" by T L Swan

Thank you so much Lily!!