Chic, you are NOT sticking your head in the sand. You have been resourceful and proactive. Once you have made up your mind, I think you will follow through with no drama or long-winded speeches to his door, just action...boom. phone and internet off, your own smart phone in hand.
and a tablet, laptop in your future for mobile access too.
You were very fair and forewarned him this was coming. I think you will feel BETTER after you meet with counselor yourself. You have someone you can get sound advice from on how to proceed both for yourself and him. there will be less anxiety down the road for you.