I know exactly how you feel. I went through this when my placement I had for almost 2 years was getting ready to go. When everyone started talking about them seriously leaving I started pulling away from them emotionally. I found myself not wanting to spend time with them. So I think it is completely normal.
Your in self protection mode trying to make sure you (and them) don't get any more emotionally hurt than necessary. Unfortunately I found that it doesn't help. You just end up regretting the time you didn't spend or the moment you backed away from that you could have shared.
I know its hard but try not to pull away. Spend all the time you can and make all the memories you can. It is hard to watch them leave but know you where there for them when it was most needed.
One of the things I did with one of my fd was look at the stars at night. It was the one thing that connected us all. No matter where we are we all look at the same stars. When she was with me and we were looking at the stars I let her know that her bmom could also see them no matter where she was. I think of her every time I go out at night.
You will always have share the memories that were made together even though they are not with you anymore. You have done one of the most impotant jobs there is to do. Just know you are not alone and it is ok to feel what you are feeling.
