Susan,
Could it be that your mom thought she had told him. Otherwise, I can' t imagine her letting him go with her if she was trying to hide the fact. I don't know what to say except maybe your Mom just wants to think positive. She sounds a lot like mine. We all deal with things differently. Sorry you are feeling so heartbroken. At least he does know now , which I would think is a good thing. Hang in there , Susan.
Hugs,
Sue