I went through the same thing, recently, when my husband's job moved us out of state and I left behind a boy I had helped raise (as his Nanny) from 6 weeks to 5 years. I felt bad about crying and being so sad, but then I realized: what kind of person would I be if I WASN'T upset about the situation? There would be something very wrong with me if I could walk away from the boy and not be hurting. Plus, I have guilt feelings, because I know I have caused him sadness, but I know that I gave him my best, every day, and that he knows I loved him. I understand, now, what I'm felling is normal and I hope you will too.