Separating from my husband

Ive been with my husband for 7 years and we are currently separating. I don’t know how to move on. It hurts me to see that he could care less about us not being a family anymore. We have a 4 year old and a newborn. Everywhere I look I see “happy” families and I want that! I am not perfect and I know that we could of made things work but now it’s too late. Too much damaged has been done, I will be moving in with my parents and he singed a lease. When will things get better? Will I ever fully move on? Will I raise my kids right? I’m honestly scared to be a single parent. I feel so lost and helpless. I don’t see my future without him but I am going to…