Trying,
I too think "no contact" might be required here. I ended up having to do that when my X wouldn't let it go. I had to explain to him what I was about to do, and why, and then just do it and turn away. He's not used to anyone saying "no" to him, so it went on for a while until I had to block his phone number, block his emails through my internet provider, and other things.
It felt so wrong at the time, but it turned out to be so right. He was eventually able to get on with his life, which he never would've if he'd still had hopes I'd come back. And I of course had much greater peace of mind, and life got infinitely better for it. In a strange way, it was an act of love for both of us.
Good luck with this. I think you're doing the right thing.
Hugs,
GL