So sorry, Madkitty. It is such a drag when a relationship, especially a good one, veers off in directions we don't want them to go.
At least this friend was honest enough with you about his feelings BEFORE trouble occured (meaning, he could have allowed his feelings to get out of control and pursued you regardless of your marital status, making things much worse for both of you).
Maybe the relationship can continue, since he has admitted his feeling and gets a handle on them. I'd give him time and space, though.
Oh, you hottie, you!!!
AS