Calling your H is a tricky thing even though he has said you can. Just tell him you are trying to respect this time apart and his need to have space. Ask if there is a specific time you should call so that you do interfere w/ his schedule. My H left here late tonight because I was at a meeting. He looked really tired and has a 20 min. drive. I asked him to send a text when he gets there so I know he made it. He said he'll be fine not to worry. I told him I do worry. I'm not sure if I said the right things but I want him to know I do care about his well being.
Good job on the detaching. I was thinking today that I need to work on that more. I wish I could say I don't need him. As for working on things even if your H doesn't come back, you will have to deal w/ him the rest of your life. He is the father of your kids.