But from what we have been exposed to,them being married for all these 13 years,and he hasn't snapped yet.. perhaps he isn't as upset with all this as you are? I don't know,hence my questions about how his take would be on all this.
It sounds like he knew about her past before this marriage started(ie:the gun at her) and maybe he is OK with it all.
I sure hope all this settles down for you(and her).Best of luck:)
KBC