How would you feel

How would you feel? I dropped my kiddos off at school this morning and texted my husband that I was going to the car wash to vacuum out the truck and clean it. He calls me 15 minutes later asking where I'm at, why it's taking so long and if I'm cheating on him. He accuses me of cheating constantly. So me being petty I said "Yep" then went on to explain how disgusting the truck is and how I'm still cleaning it because there's crap caked everywhere (we have 3 kids). When I got home he told me that if he EVER actually catches me cheating that he would shoot me and the person I was cheating with. He said "i will do it without hesitation". I have NEVER CHEATED ON HIM. He cheated on me back before we were married about 8.5 years ago. I said that he was the person that documentaries write about murdering their wives and he snapped back that i was the reason that they write documentaries and everyone agrees that the wife deserved to be murdered. Now he's joking around smiling, acting like that conversation never happened...