I totally understand the feeling of sadness. When my W and I first separated, it was horrible after she would leave. I would be so sad, for the reasons you pointed out.
A couple times I did email or call to say what a nice time I had - inevitably it would backfire (she would be cool toward me) and I would feel worse.
Learn from my mistake. Play it cool and calm. It is obvious that she is wanting to come back, so sit back and let it happen on HER terms. Be patient, fish. You have your whole life ahead of you, what's a few weeks in the grand scheme of things?
