She may act different
She may act differently when staying with your husband. She may act like a little girl or something. You husband may not marry her. Don't worry about him. Don't think about her. Comfort your two kids, and let them have a stable life.
Your husband wants to be young again. Do you want to be young and beauty, and to be loved again? Take care of yourself. Think about when you were 18 years old, what did you want to do? What dreams do you have? Do you want somebody love you? Think about the love your parents gave to you. You don't belong to your husband. You belong to yourself. You have two sons and they will love you. You will have somebody love you later on. Even don't get married, just live together, and enjoy life together. Enjoy your new life. You will be fine. You will be young and pretty again.