I understand what you're saying about losing the connection, not with just a best friend but also possibly losing that with all of the friends you share. I imagine it's a very daunting and even frightful thing to be contemplating.
Is this group the only circle of friends that you have? Can you make opportunities to meet with other people (co-workers, family and THEIR friends, etc.)? Are there any friends within your current circle that you have brought in?
If things fail with the OM, wouldn't you be faced with this very same issue?
I'm not trying to put anything you've said in a negative light. I am simply trying to understand where you are at in order to better understand where my W may be at. She has alienated most of her "real" friends for the friends she has made on-line (none of whom she has ever met). I imagine that if her relationship with OM ends, she would be concerned about 1) reconnecting with the real friends she has pushed aside and 2) remaining friends with her online community.
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07