Three Way, My Way?!

She has always been my friend, she intorduced me to him. I've seen them fall in love and fall apart. Now they are both my friends, only in 2 different worlds. I can cope,I am OK with the situation. I don't think they can!
They've both -presumably- moved on, but have they actually fell out of love?
Now I'll tell you the symptoms and you do the interpretation:
- I know she misses him
- I know he is lonely
- Neither have been in a serious relationship since they've broken up (almost 5 years ago)
- He asks me about her
- She gets nostalgic
and the list goes on..I think you get the picture.

What am I to do?I see them both suffer, but can I help? Is there anything I can do when they don't seem to give their relationship another chance, specially him?
She is my friend - note: she never asked me not to talk to him again- and I know exactly how she feels..but it's him that I can't figure out. If he's sure that she is a 'closed door', why do I hear his "how is she?" often?!
I'm no expert, and I am stuck in this three-way-tango that's getting me down. I always thought affairs of the heart should take care of themselves, God is there planning for everything, but could it be that I am His tool??!
Is there such a thing as the Curse of the First Love?? That keeps haunting you through your days and nights, practically making life unbearable. My heart goes out to both of them... but I feel so helpless!!
HELP!!!