When we are consumed by what another person will or won't do, will or won't become, we guarantee ourselves a life of unhappiness.
We need separation, we need to be able to see other people as separate from ourselves and recognize that we are each on our own paths.
CdnDW - your mission is one of acceptance. Find acceptance for yourself and for the situation. This is a stage of grieving and is completely normal. Like the serenity prayer states so perfectly:
God grant me the serenity
to accept the things I cannot change;
courage to change the things I can;
and wisdom to know the difference.
And it is just that - a sense of serenity will be achieved when we can accept reality and claim providence over our own selves because our path, in reality, is the only one we can change.