It sounds like he’s rubbing it in with his success, making he’s out to be the big I am. And he’s trying to make u feel he’s doing well because u dumped him, but I could be wrong.
With the crack, it’s just a slippery slope and really addictive and people waste hundreds and thousands on it.
My opinion is if he’s bad on it, leave him to it and you get on with the rest of your life. Try not to beat yourself up over it. Just think about your self now.