I've never felt so low

My heart is breaking. I'm going through a break up that wasn't my choice. I look at my kids and I feel so sad for them that I couldn't keep our family together, I'm writing this with tears streaming down my face. I feel like I've hit rock bottom and I don't know what to do. I couldn't keep him happy and I wasn't enough even though I loved him unconditionally. I wish I could stop feeling like this