Continuity mistake: When Slim and Mitch embrace after she finds out he is cheating, she is wearing a purple dress/robe, but for some weird reason after the fade out, they are still embracing and it has changed to a white tank top. (00:18:14)
Suggested correction: It's not for some weird reason. It follows the fade out with the title "more than enough" and it's meant to creatively signify the passage of time between the two embraces. The first embrace is after Mitch tells Slim that everything is going to be OK, even though he cheated on her, and she believes it. Then a notable amount of time has passed, both of them are dressed entirely differently, and with this turn of the second embrace Slim tells Mitch that she can smell Darcelle's perfume. So she's now aware of all his lies.
You are correct. Slim finds out about Darcelle. She smells the perfume on a different day - meaning that Mitch is still having affairs. She says "You're not going to talk your way out of it this time." So time has passed since she first caught Darcelle's page to Mitch.