I have been in a relationship for a year and everything is going good.?

I have been in a relationship for a year and everything is going good. The thing is in the past I was an manipulator and I lied about having a miscarriage to hold on to him. I have been feeling bad and Im afraid when we have children or when we plan on it I think he will leave me. What should I do with this situation. The truth is I dont want him too find out and I know he deserves better but I want your advice.