To have a healthy relationship it is important to communicate.
there is a difference between private and secretive.
things like your medical history, family problems, your friends problems, and etc are private information and you should only tell him if you, and the people involved are comfortable with it.
secretive is hiding small things like your picture gallery, who you’re messaging all hours of the day, etc.
you have to be clear to him with how you feel. if you’re comfortable with sharing what you were hiding then it will probably be easier to fix things.