OP - Just ignore some of the more spiteful comments in the thread. There will always be some of them. You've already responded to some of the thoughts further up thread, there's no need to repeat yourself - just tell them to RTFT.
I can understand why people are going along those lines - and although you might truly believe that they don't apply to you (and I'm not saying that they do), surely you can understand the viewpoint overall?
Maybe you guys have been doing this for so long that it just feels normal to the two of you, but from an outsider's perspective it is extremely weird to have a married man chatting to his ex at 2am when his wife is in bed. Even if there is nothing sordid being said, it still just comes across as inappropriate. It's too intimate.
I believe you when you say that none of this has been an ego boost for you - but for a lot of people it will have been. Knowing that someone would rather talk to you than go to bed with his wife. Knowing that he has been thinking of you all day...blah blah blah. People on the thread are just being very rude about it by insisting that was the case with you.
Even if you completely don't see this - and I believe you when you say that you don't - from what you have said on here it really does comes across like you are the third person in this marriage. Not as a mistress, obviously, but put it like this - if I was his wife, I would hate your guts. I find it quite funny how you can't seem to understand why she hates you so much!!
To be honest, with all this sustained contact, skyping, conversations at twilight...I'm actually not surprised at all that he got feelings for you. I mean, this is pretty much how teenagers started dating when I was younger. You are friends, you end up chatting online on a regular basis, you might call each other (or skype these days), you share history or stories together...then bam. Relationship. Or unrequited feelings.
Out of curiosity, are all your friendships like you friendship with this man? Do you chat as regularly to your other friends? See them? That sort of thing?
No-one is saying that you basically can't be friends anymore. What you do need to do is to cut contact for a couple of months to give him some space, and then just establish a friendship with "normal" boundaries. That's meeting up for a coffee every few weeks. Having a chat on facebook during normal hours with no mention of poems or songs or anything you wouldn't be happy with his wife seeing.