If he wants to develop with you, he shouldn't mind if you bring an extra friend. Tell the other person frankly that you want to bring an extra friend because he is worried about your safety.
Remember to show that you don't suspect him of ulterior motives, but that your friend is really worried and won't affect your contact and understanding. Look at it a few times and feel it before moving on.
I never think I'm safe, just try to be satisfied. Our life can't stand a little risk.