So basically what he means when he says that "you gotta tell her,"
The dad killed the little girl. Which is why he made the comment while choke Michelle, "Cathy wants all of this to be true. So you can either play along or I'll tell her your ran away again." And before being stabbed by Cathy, he says, "you're not my little girl."
Personally I feel that all of this could've been avoided had someone thought of doing a DNA test. But now it leaves the door open for many more questions. Like why Michelle just won't come out and tell Cathy the truth and where is the real Michelle buried.
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