You get the type of marriage you ask for.
If you want to have a marriage where you both keep secrets from each other because you’re afraid the other won’t love you if they know–go for it. You won’t be tricking him, because he’ll be tricking you also. It goes both ways: if you aren’t open with him, he’ll pick up on it, and not be open with you.
And don’t think it won’t continue after you’re married. If you aren’t secure enough in the relationship to tell him about what happened two years ago, you also won’t tell him what happened at the grocery store, in fear of rejection. And he won’t tell you what happened in yeshiva or at work.
But you will be tricking yourself, because you’ll think you actually have a marriage when really all you are is roommates.