Hi there.
There are loads of us on here that are in the same situation or have been like myself. It doesn’t matter how much you love them when coke is involved. It is destroying you at the moment but it will destroy your relationship eventually. Every so often was my ‘husband’ until it went to every weekend, then every night. If he values you and your relationship he must try to stop, seek help. If not you will lose him to the coke and he will have no emotions whatsoever. My ‘husband’ chose the coke and its been a difficult, painful journey.
Remember he can only help himself. Mean while you need to look after yourself. Hard I know, I’ve been there. Crying, worrying, talking, arguing but it has done me no good. it made me ill and it will you. Concentrate on yourself until he comes to his senses.