............and you met on collarme?
Yeah, I don't place this much trust in someone I have known for a year. Three days? Let him buy you coffee in a restaurant, at least get a feel for the guy, let your intuition have a go at him first.
Don't trust just anyone with your entire body. If he can't understand your concerns, then he isn't ready to conduct a session....or he is a bad Dom...run a search for "bad Dom" and read up on it, I bet you will change your mind!