A friend that you grew up with can be a great friend - understanding and supportive. The danger is that as JW's we are conditioned to reject 'false teachings' of apostates. If your friend suspects that you are doing this to him, he will drop you like a hot potato.
JW friendships are always 'conditional' - on the condition that you are an active Witness. Otherwise you are labeled as bad association.
Don't feel discouraged when your friend no longer communicates with you. It will happen at some point.
He is a victim of confirmation bias.
All the best - -
ginger