I'd be very angry to discover someone was stealing things from me. I don't have a lot of nice things so it would make me mad. Even if it was my kids, I think maybe even more so if it was my kids. What disrespect.
Maybe due to the drugs he doesn't remember. I don't know if meth effects your memory. I just know it's very bad for your body. But, even so, that doesn't mean it didn't hurt you and that he shouldn't make amends. Just like bipolar, maybe I'm manic and being irrational, but that doesn't excuse me from saying "I'm sorry" later.
I agree with genetic on this one with setting up a payment plan to pay you back. 3k is a lot of money.