You are still here because your spouse has changed the marriage on you and you weren't prepared for it. You are dependent on your spouse and it's a scary thing to contemplate leaving, never mind actually go through with leaving.
Take care of you and start thinking about making some changes for yourself and your kids. Maybe take some classes so you can try to get back into the working world. When you can take care of yourself financially, you won't be so scared.
And you are not weak! You might be weary, but you are not weak. You will get through this and no matter what happens with your marriage, you are going to be okay. The early days are really, really hard and you just found out, so you are going through the really hard part right now. It does get easier and for some people it gets better and some work out their marriages. Ultimately, you are the one who gets to decide what happens with your marriage.