Hi there
Been in the same situation. My male friend and I kissed at a party 6 months ago and so I ended up falling hookline and sinker for him. Trouble is we are both married and I don't think he feels quite as strongly about me as I do about him and so nothing has happened between us since, even though I would have liked it to.
I am deadly jealous of his wife, which makes it hard having a friendship with her properly now, but I see her quite often and my children and friends with their children.
But I have just had to grin and bear it, I have had some terrible days being upset during those last few months. It's very hard falling for someone who either doesn't want you back or has just not noticed your strong feelings for them. Sometimes just being around them as friends is what you have to make do with at least you have that friendship.
Time is a great healer.