Of course you can move on. Welcome to the world of digital blocking.
But I love him!
you'll say. I want to talk to him!
He is safe. With him in your back pocket, you don't have to take any risks whatsoever. You also don't open yourself up to anyone else. Why should you? You're oh so happy, right?
Except you're not. You've been wishing and hoping for something more for the better part of a decade with this loser who seems to be best able to relate to you by paying for your schooling.
You don't owe him anymore or, if you feel you do, then save money to pay him off, but do so. He is a financial backer who you cybersexed.
You won't find someone else if you continue with this.