I agree with Alison and Yail. I like Yail’s re-writes and the reasons for them. The email is written in a very thoughtful FS-like manner. I get what you mean when you say that you fear it FS. I think you it is not only his reaction that you fear but maybe also his non-reaction? Also...that by being the one who places the boundary, he may say that it was your doing. My H did that when I finally told him not to come back until he was sure he wanted to be here because he kept saying he was coming back and then backing out. He thanked me at the time as he said he hoped it would give him clarity...four months later his story was that I had “kicked him out”.
I think you have to do what is best for you and the girls irregardless of what he may or may not do. It is really, really hard but like you said, the limbo you are living in is very confusing for all of you. (((HUGS)))