Frustration

This is so hard. My partner can't heal. He keeps digging and digging. There is nothing else to find. He keeps backsliding and saying that I'm still not being honest, but I'm not hiding anything anymore. He knows EVERYTHING about the adultery. The OP is gone. I even blocked him on my phone. I don't know what else to do. 
I am lost. 
I know that I lied before about a lot of things (mostly surrounding the adultery, but not entirely), but I have not been lying and he still thinks that I am. Even when I give him the explanation about what some old charge is or whatever, and even offer evidence... he still finds a way to decide that it is a lie. 
What do I do?