pinkmilk,
OMG I cannot imagine what you're dealing with and am in awe of how well you're doing it. It does seem unlikely that he would lie about it if he was forthcoming about the stealing. At least he is getting a clear message about how much you care.
FTR, I used to do that to lighters, too. I was quite the pyro and loved to see things burn. I remember once even pouring the lighter fluid over my hand and then lighting it. It was kind of like putting your hand in the flame, didn't burn as long as you keep it in the blue part. However, my hair did catch fire and that was not pretty (ewww, smelly).
Now DH won't even let me light the grill

--go figure!