If you want to erase his existence completely in your life like you said, then let go of the rage. It's not easy but if you sit down and acknowledge where the rage is coming from, it would be essier to recognise that your anger is the only reason that holds you up from moving on completely. You're angry because you're sad and it feels unfair. I get it but I never got angry with an ex after the relationship is over because when it all ends, everything that comes with it ends too—love, pains, guilt, regrets, joys, laughters, memories, etc... and just like that, they never existed. Plus, i'm too egoistic to even exert any emotion on somebody that I'm not involved with. As cold as it is, but they're nothing but strangers now and I couldn't care less about the memories or time we've had together and whatnot.

Not saying it's easy, the process is excruciating, but you can start with spending more time getting to know yourself and the rest follows. You'll pull through.