Its not good at all.. and mixing coke with alcohol isnt good to. It produces another drug in your body called co ethadrol… i think its called that, but that is what stops alcohol effecting you when coked up. So you can drink loads and not get pissed.
Id just speak to him and see what he wants. And if he dont want to be with you, i know it will be hard but it probably might be a blessing in disguise.