My case... He said the same thing to me. He said that he didn't need to tell me honestly, but he told me that he's using cocaine... And he really wanted to change... And then, he told me that he's so happy that I didn't walk away and tried to find him therapy treatment. He said that he'd join. Even said that he talked with his addict friends and they both wanted to join. But some weeks later, he said again 'I don't need to tell u, but I tell u honestly.' XYZ(his friend who was interested to join therapy treatment) told him to snort one or 2 line of cocaine, he had been thinking for a while but finally decided to come back home.
I thought that the honesty meant the decision to get clean... But it was just my wish or fantasy