Haunted, please stop looking at h f/b or any social media of his. All it does is cause you pain and upset, no good will come of it. Only have communication with him regarding the children, keep it short and to the point. If it is not necessary then don't contact him. I know its hard, I really do, but I am just thinking of you and your sanity.
Read threads here from the beginning, you will see that most of us have written the same as you - that our h/w have said hurtful things like they no longer love us, never had feelings for us ever, that leaving us is the best thing they have ever done .... this is part of the MLC, its a false world that they have created in their heads, they truly believe it, nothing and no one can change their minds as they are convinced they are right. Hopefully one day, your h will wake up and see what he has done to all those around him and like many post MLC'ers he will feel regret and remorse.
I really do feel your pain, it was not long ago that I was where you are now so I do understand how hard this is. You going to be ok, you will get through this, it does take time and determination, just keep the focus on you, keep moving through the days as best you can, it will get easier.