I'm going to ask my bf to slow down his drinking
I'm concerned for him too, does he have a drinking problem?
He drinks too much therefore he can't have normal conversations with me
It's a good idea to intervene, drinking is unhealthy. If you don't put a stop to it now he could end up an alcoholic.
I can't always be around him watching what he does.
I know you can't always be there for him and that is understandable, that's why you need to urge him to try to be sober or maybe get a sponsor that will watch over him during the times that you can't be there for him so that he won't drink too much and cause problems in the future.