" Is it ok to celebrate victories such as when he has 1 week clean we can spend time together then again when he has 2 weeks etc."
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He is an adult he is not a child who brings home a school paper with a gold star on it.
If it were me, I'd keep him as an ex, he is not in recovery, he is only bumpin his gums, talkin out of both sides of his mouth.
He knows exactly what he has to do to be in recovery, he is not ready.
Keep reading, it will help you.