Here you go again. You are letting his words get to you. If it is so easy for him to leave you with just a flip of the coin, then why did he come home?
This is a cycle for you guys. He uses this every time he feels insecure and you fall right into it. Step up to the plate and the next time that he says that, let him go in word and action. Tell him if that is what he wants to do, then do it, but to stop throwing it in your face. That you have told him many times that you want him here because you love him, but if he insists that he is going to go then go.
He is having a pity party and you keep joining in with him. He is searching and wanting you to give him the answer that is going to snap him out of this and you can not give him that answer. He could not give you the answer that you needed. The only person that could help you was the Lord. He took everyone out of your life until you looked up and called on him.
Your husband is alone and in depression big time and doesn't like what he feels. Then he has to do something about it and stop wanting you to do it for him. You are his crutch. The only thing that you can do for him is pray and put him in the hands of the Lord. Trusting that the Lord is doing exactly what he needs to in order to change your husband.
Your husband is being stripped very much in the same manner that you were when all of this started. Now he is walking in your shoes and acting like a little baby. Nobody loves me, feel sorry for me, make it go away and blah, blah, blah.
Let the peace of the Lord come into you and take care of you and let the rest go.