“I am quite a happy married woman, But recently I often have a former fiance in my dreams. It worries me. Maybe I did it wrong, leaving him?”
The former partner appears in your dreams probably because, that he once meant a lot to you. However, since you parted with him, There was definitely a reason for it. To, that you are thinking about him, does not mean at all, that you would be happy with each other now.
Instead of going back to the past, Focus on your marriage. Possible, that something is missing, What the old beloved gave you. Carefully think, What could it be – long talks, common interests, Successful sex life.
When you understand, what is your disappointment from, insufficiency, Gently tell your husband about your needs. And try to slowly make changes to your relationship.