@OP
I'm saying this in all sincerity. You have to be more assertive. You should have told him to eff off and blocked him. You're a sub not a door mat..and he is a manipulative, narcissistic, and lonely piece of shit. I mean seriously? Who does that? In BDSM or Vanilla relationships and he is giving off some serious psycho vibes.
I have two male subs and 1 female subs in my service and I personally do not care who they speak to online as long as I'm not being disrespected. I don't stalk their online activity. They are free to speak to who they please because THEY ARE STILL PEOPLE.
You are a person that deserves respect and care but unfortunately you have to be very assertive when you're seaching for a Dom because there are so many predators out here. I'm a little nervous about what you would do in a real life situation. This is your safety....take control.