Little Prince's Birthday Worries

As it gets nearer to Little Prince's birthday he has been coming out with some odd things. He keeps talking about mummies that never see their boys again, when I probed a bit more deeply about this, it turns out he was thinking of Tummy Mummy. He has also been quite clingy, and even cried and said he was worried mummy wasn't coming back, when I went out to run a few errands and left him with Little Miss Sensible. Then when I did get back he spent a long time sat on my knee, sucking his thumb and cuddling his blankie. He has also mentioned being lonely or at other times he has said he is sad, but doesn't really know why. I think he is getting to the age when he is starting to understand that his living in our family, means he has lost another family. It probably isn't helping that he has also recently lost The EX (who he idolised) and he thinks it is something he has done to make The EX go away. Poor little lad :-( We are trying our best to be extra reassuring, and giving him the cuddles and closeness he obviously needs at the moment. Its heartbreaking seeing my precious little boy so sad though - I want to fix it, to make him feel better and I know I can't, I have to accept that I just have to be there to support him and reassure him. Love you Little Prince xxxxx