Never beg anyone for anything. Nothing is worth that.
Feelings are running high. Let him be a while longer, then if you must contact him, send him something casual. You can say you miss him, but lengthy messages are a no. Keep it light. Don't apologise. He loved you before - he won't hate you forever. He may never want you back or love you again, you might not be friends even, but the hate will pass.
He's probably upset, and unconsciously blaming you for it. That too will pass. don't blame yourself.
We're here for you.