How does Spade react to Iva's apology in the eleventh chapter?

As Spade prepares to leave, Iva Archer enters Spade's office to apologize for sending the police to his apartment out of jealousy for Spade being with Brigid the night before. Spade forgives her for this act but does not believe Iva's story about the night Miles was killed. He sends her to see Sid Wise so that she can answer the police questioning properly.