B.f going to therapy for porn and lust addiction

I'm preg. I found out that fiancé is addicted to poem and woman sexy chats. He lied and hid it so much. Now he's going to therapy for the first time to work on it and us. I found out he messaged a teen who he says he didn't know she was young. Would you support his therapy dorm far would you stay in the relationship andwork on it if he shows change? 

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