I don't remember the movie's name, but it's the one where Geoffrey Rush plays an incredibly successful but socially stunted art appraiser who tries to convince a literal shut-in artist woman to come out of hiding. I don't remember why exactly, but I know he has the help of his long-time butler and a mechanic acquaintance.
He manages to do it, and finds out the woman is a twenty-something hottie who appears to fall for him. Both seem to work out their differences and the main character finally finds the love that his life was sorely lacking, since throughout the movie it is revealed he has massive mommy issues that made him scared of pursuing deeper relationships, and the vast majority of his fortune is in very rare original paintings of women, which he keeps stored in a very secure vault.
Then comes the final 10 minutes where it's revealed it was all a plot to steal the guy's massive fortune and collection. The butler, the mechanic and the girl - the only people he ever trusted in his entire life - were all on it to exploit his traumas and sweep him clean. And the final scene twists the knife further by implying the main character is still in love with the girl and she will magically come by to meet him at their usual place.