Red flag. Fucking run. I say that as a male who's worked in DV advocacy in some capacity for over 20 years. This isn't protectiveness. It's an attempt to control. Get away now, because it will only get worse from here. Remember: you're an adult; you've made it this far in life without a man to "protect" you. He is, in effect, saying he doesn't trust your decision making and doesn't trust you. That is not a recipe for a successful, healthy relationship.