It's simple. It's from a movie (I think.) It's true. " If you love something, let it go. If it comes back to you, its yours forever. If it dosent, then it was never meant to be." Or something like that. But then there's the 38 Special song: Hold On Loosely (but don't let go.)<.....the second one is for people who are not separated, but you could also take it to mean, let go, but let the person know how important he/she is to you, no matter what the outcome.
Love is so complicated, especially when long distances are involved. But if there is real substance, chemistry, compatibility, laughter, wit and fun to the couple involved, and add in history, there may be a chance that she will find her way back to him. Otherwise, he will survive this. I know because I have been through it, more than once. I also know that sometimes people can think they want to be free, but after a good break, decide they want to try again.
A lot of us know that when we are overwhelmed, we can think we are because of our mate. Then when the mate is gone, we figure out the problem had little to do with the mate. Time will tell.
Meanwhile, your son needs lots of love from family and friends to remind him how valuable he is. It won't stop his pain, but when he feels the lowest, he will still feel like he is worth a lot to others. When I left my first husband, my friends and family wouldn't let a day go by without dragging me out for coffee or to the fair or to go shopping or anything that kept me from staying home and drowning in my tears.
And tears: they are so cool because when you have a good cry, aftewards you feel like you took a valium. Crying is very cathartic.
Even if she never asks him back, no one can take away their history together or their sentimental memories and feelings. No matter what, we always carry those we love with us in our hearts, even if the relationship evolves into another kind of relationship.
Everyone is different, but it always takes me about six months to work through to the feeling that I indeed will live and enjoy life again. Whether it is death or lost love or an empty nest or lost friend, for me it is six months. And grief comes in waves, with time to rest and regroup in between.