A man shared his story with me about how he was in a long relationship with a lady, it lasted for a very long time that he expected it to end in marriage, but it did not. What was his regret? his regret was that during the long time of being the relationship with this lady, he shared a lot of his personal information with her, and she even knew his bank passwords and pins and was able to send away all the money in his account just before she left him, leaving him broke. Could it have been his bitcoins? yes, but he is not an investor in bitcoins. How about you? are you being too open in the relationship you are keeping that is not yet marriage, you could be doing yourself some harm by exposing to the person who you are in a relationship with where you have invested which is in bitcoins, and even giving them too much information about how you have kept your seed phrase safe. 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.
Even if you're married, I don't see any reason to share that much of information if both truly respects each other's privacy and as long as both provides for their relationship. It is reasonable for them to ask sometimes but for them to insist such information as bank informations and you should know her intentions or purpose well if ever you came across with such instance and you should reason it out as much as possible. If you fear of dying and letting your investments in empty space without having anyone access of it, then that's a rare instance to avoid.
What your friend needs is to learn how to choose a nice person to have a relationship with, I believe that everyone here who is married shares information with their wives or husbands, after all a marriage is about living life together sharing everything, right?
Well yes but not in all relationships. Also, you would be able to know a person well as you guys are being together for years. For sure you'd be having enough reason whether to share it or not. Everything could be reasoned out in the first place on why would you or not share such details. It just depends on how you will deliver the message and to not offend her.