Hello :-)
I remember not to far back when i did similar things. I date a girl and promise her the moon and the stars, but i meant it, because its what i really wanted. Of course i couldnt keep those promises due to being controlled by alcohol. Eventually id ruin things somehow and find i coudnt face the girl, for shame No1 and 2, not wanting a blasting which i deserved. All the time i drank i was in denial about almost everthing bar thinking that drink was my main concern. I wanted good things, sure but i never capable of being consistant with things other than getting drunk.
Its possible that distancing himself from you is his way of being honest with who he is at the moment. I know things hurt but, perhaps you do yourself a favour by not taking it personally. As sad as it sounds, drinkers go where the drink is. At least i did, but, when i had my moments i was completely gutted about who i was hurting.