As usual, I seem to be in the minority here. I think Sad Guest is cutting off his nose to spite his face. And maybe not really being honest with himself in the run-up to it.If the friendship is as special as he would have us believe, he should be happy to see his friend happy — and ready to be there for her if she isn't. In the meantime, do a reality check and learn to live with the reality.
If you want a friend, call her up and tell her so. If you want to own exclusive rights (didn't somebody outlaw slavery a few years ago?) and she isn't willing to give that exclusivity, maybe she has good reason to look elsewhere.
JMO —
cheers,
david