It has been said that if you can count your TRUE friends on one hand at the end of your life, you are very lucky. Many times, we think people are our friends when really all they are, are party buddies. Maybe, having that one true friend is what is best. You will make new friends, but the most important thing is to guard your sobriety.
I am sorry to hear of the loss of your friend. People will come and go in your life, but staying true to yourself is the most important thing. As you get older, you will realize how very true those words are.