Hey, I'm not the Captain but in a similar situation to you and I thought I might provide an answer. Please note I am not psychic or anything, just a normal woman...lol.
I think when you only communicate with someone by email, text, bbm, etc., the sharing is much more intense. That is the only option you have so you tend to give as well as receive much more information that much quicker and if you have a connection as well, then it is indeed frightening how strong that can grow.
You are going to feel connected to him, not only because of the friendship you had but also because he is a habit. It will take time for those feelings to lessen and for you to detach. Allow yourself to go thru that and be kind to yourself. Sometimes purely emotional connections can be the hardest to let go.
I have a friend like yours and despite the difference, we just really click. We wrote each other every day for about two years. Now, it is not every day but we check in with each other once or twice a week. At some point, we will meet but it's not as all encompassing anymore, it is just really comfortable and I give thanks for him.
You really need to just accept that you had this beautiful moment for some time and it was good for you and for him. I am not too big on getting psychic impressions on a relationship that I am part of because when I did, the psychic was wrong. I think you in your heart knows the answers to all your own questions and don't let the missing of him or the relationship spoil whatever good you got from it.
Sorry to interject into your conversation with Captain but I just wanted to provide some support and hugs to you.