This is not a friend. A real friend would be glad that you are taking steps to become healthy and would be supportive. This person just need a drinking buddy and might even deep inside resent you and try to bring you down. For all you know, he has taken bets about how long you'll go before you pick up again.
Your sobriety vs that kind of "friend" should be a no brainer.
One thing I have learned in recovery (and it took me a long time to understand what it meant) is that What other people think of me is none of my business.
What's more important to you? Being sober or what that person thinks about you?