Yes, don't text him again. Or at least wait 24 hours. You already stated your terms and boundaries STOP ENGAGING there is nothing to gain from continuing a negative interaction.
thanks Traveler, you are right. I am ceasing contact completely now. After he (threatened) said what he said, he called 5 times in the span of 30 minutes. This is uncommon for him and I just ignored. True that I feel at this point the only interaction I will get from him is going to be negative.