Why would anything I do matter to him ?

He’s trying to maintain control over you and, in doing so, wants you to come crawling back to him, pleading to be with him. It’s nothing more than a control issue, a power trip for him.

I agree with kripter , Yes he is controlling you, stop answering his questions, calls and texts there are better men out there.

You don’t need this nightmare to get worse.

He is insecure and YOU are letting him feel powerful over you every time you comply to his demands.
This is possessiveness not love.

Why are you receiving his texts? Block his number on your phone.

The key part of your question is “ex.” This guy is past tense. Block his texts and phone calls, and send his emails to spam. He’s a man who doesn’t want you, yet who enjoys controlling and playing with you. Please excise him from your life. You deserve better.

Yep, as far as he’s concerned, just disappear. If he escalates it, start documenting every attempt to interact with you, because you may need to get the police involved. He sounds like someone who could get really nasty. I would try not to insult him.

Edited. (Spell check changed interact to interracial)