The sweet relationship can go sour in a moment and that your lover can become your enemy. Unless you are married, do not share all information about you with the person you are in a relationship with.
Sometimes even in marriage it is not advisable to share all your holding informations with your wife. The marriage can still go sour and she will leave you and run away with all of your money. Marriage is suppose to be a trustworthy and honest relationship between two people, but sometimes things turn around and you might separate out of some kind of misunderstanding between you two or any unforeseen circumstances. Before sharing all of your secret with your lover, you should be satisfied beyond reasonable doubts that the person is not someone that can leave you through thick and thin and will not want to cheat you. Overall, just be careful with who you share your wealth secret with, if they’re doubtful, don’t do it. And when it becomes necessary to do that, have some back up or something still only you can give the authorisations to the access.