You may be interested in this thread, started by Jilly (one of the moderators):
One of my last close friends, who is a guy, will probably be getting married soon. How do i try to remain a part of his life without getting his wife irked? We like to go hiking, backpacking and paddling together and I would be broken hearted to lose that large part of our friendship.
... I am starting to have a bad feeling about this. It really isn't fair. I have been doing these things with my friend for a decade now. His girlfriend has only been in the picture 6 months.