missing pieces and feel like a horrible parent.

The worst thing about separating from my husband is the fact that I had to move across town and move my son yet again to another school. We have moved every year for the last 4 years and each year he has had to go to a new school and when moved the last time I promised my son that for middle school at least he would be in the same school for two years and then if we did move we were going to try to stay in the same school zone for high school so he got to keep his friends. But i couldn't afford to stay on that side of town by my self and I had to break my promise to him and that breaks my heart cause he is hurting and having to start over more then me. He is so upset that he has to go to another school thankfully some of his friends from two other schools feed into this middle school so he will know a few kids but some of them he hasn't seen in 2-3 years. I feel like a horrible parent because i couldn't keep my crap together with my marriage and his life is in pieces because of it.  I know how he feels my parents moved me a few times when i was in middle school and i made a promise to stop because i thought things were good and I didn't want to move him again and yet here I am right were I didn't want to be. I can see the pain and anger on his face and it tears me up worse then i already feel about my broken marriage. Next year when he goes to high school again it will be a new school. I am sure the school district thinks we are insane and i worry about my sons mental health with all the moves and changes. I know that I suck dealing with change and i know that he is like me so I can just imagine what he is going through. I just wish I could be there more for him but i can't afford to take off work. I am grateful to my husband he is a good stepparent and is trying to be there for what ever my son needs he is trying to support him and help out where that is concerned. I just wish that we were doing this together. We are a good team where my son is concerned.
On that front about a week and a half ago he had talked about us possibly trying to work things out and then we hung out with my son last weekend and it was awkward but normal as well. I don't want to bring up trying again until he does because i feel if i push the subject that it won't happen or that he will tell me no and i will fall back to the bottom. I have been doing ok. I don't know if talking to him and trying to be friends is going to help me heal but i haven't been so sad all the time. I miss him as my husband but I am still working on me and trying to figure out what i want. The only thing i know is that his brother keeps pushing for him to give me the divorce papers. I know he has them and he has signed them, i saw them when i went over to get my stuff and was snooping but he hasn't given them to me or even talked about giving them to me, he has just said that his brother keeps pushing for him to give them to me and end our marriage but he won't yet. Wishful thinking on my part i guess maybe he does still love me and doesn't want to end this just wants his space. But part of me says don't be stupid he is just trying to make sure that its the right time and that he really doesn't want me except for maybe a friend. Just when we are together he asks for hugs and talks to me like nothing has changed. I don't know I just hate that all this has happened and that i have to feel so broken like there are several missing puzzle pieces that won't ever go back together or be replaced.