This dream is what we call an emotional restoration dream. It reveals your emotional condition and it also brings emotional relief. Emotional restoration dreams serve as a “pressure release” mechanism that helps people to cope with traumatic events and incidents that they experienced. So you do not have to act on any of the symbolism and messages in the dream, apart from, as you already have done, praying that God helps you to forgive your husband and this woman and that He helps to restore your marriage. Obviously, you and your husband will have to go for counseling. He needs to stop this behavior and you need to deal with the hurt and the emotions that it caused.
I am sorry that this happened. You need to seek God’s face and his grace and power so that you can deal with this.