I can empisize with your situation. Although my SO didn't move out (I got movement orders instead) the termoral/feeling were the same. There is a lot of good advise and some exsteam, you need to identify/list all items that apply to you and your situation and start doing something about them. As far as counceling, get going know, either way (diveorce/reconcilation) it is determintal to you (emotional well being) or getting your kids (court custody issue). NO MATTER WHAT HAPPENS, the kids need the best protection/care possible. As far as your mother, sorry for being burtal but tell her to bug off. The time for her imposing (teaching) her views is over and you have to live with your decisions. Sorry for being so blunt, pick yourself up by your bootstraps if needbe and move on. NO MATTER WHAT HAPPENS, it does hurt (deviorce/reconciliation) but the kids need a functional family (you and/or you and SO if possible) to provide the best protection/care possible. If needed you can PM me, I have a big shoulder.
Hugs
Alice