Mighty - these fake reconciliations - an extreme form of touch and go, are among the most hurtful aspects of MLC. I am so sorry that you are going through it. It may not help to know that many of us here have one or more of these, except that we understand your pain, and as Job says, it can be more hurtful when they pull away into the tunnel the second time. Except of course that we know what MLC is and we do bounce back quicker.
They do not know what they want. Let your xh deal with your children and keep as distant as you can from him and his drama. Dealing with MLCers is crazy making.
Above all take care of yourself, and stop monitoring what he is doing completely - this includes 'happening to notice'
They are nuts, and not good to be around right now.