Elaineo, sorry you had to find us but welcome.
My son also stole some jewelry from me. It is a terrible betrayal. To have him turn on you like that is infinitely worse.
Elaineo, I hope you realize he and girlfriend are full of crap, no offense intended. Let that ludicrous nonsense roll right off of you.
Exactly what is his idea of a *good* parent -- one who lets her son steal from her and doesn't file a police report?
He and his girlfriend should be absolutely ashamed of themselves, not just for the theft but for attacking you with a baseless and ridiculous insult once they are caught. I hope that is his addiction talking, not him.
Either way, you certainly have my support. The only guidance I would offer is to give serious thought to pressing charges, as well as making sure son and girlfriend do not have access to your premises or your valuables again. He needs to make restitution to you and the merchant, and he owes you a BIG apology. Until both of those occur, I am not sure I would have any contact with him at all.