Hi wilde,
In my opinion the shame we feel about our antics and things we have done is already an enormous burden to carry in itself and can often lead us into having another drink just to try and forget out it.
I dont see any need for him to know anything at this stage about your recovery or indeed your past drinking history.
I think you could just say that when you are not drinking you feel much more alert, your skin looks better, and you feel altogether more healthy so for the time being you are not drinking any alcohol at all. There is no lie here at all as all those things I just metioned are very true. I cannot see the point in heaping pressure on yourself at the moment with lenghty discussions and probably tears and tantrums that will only make you feel bad.
I think that whilst we are in recovery especially at the early stages we need to keep everything as calm as possible.
Good luck hun