If you keep your Private documents hidden and invisible to the public, it saves you from sorts of risks.
I think that my cousin brother was up to some negative thoughts because he can't claim not to have known about what Bitcoin is and yet he knows about the Apps in used for it. Trust no one with your privacies and keep your source of income that has to be kept secret in a secret.
Why am I feeling happy with the reply you gave to him on his request to know if you were a Bitcoin investment or notnot? Because he really deserved the those cold reply for trying to outsmart you thinking he can have acese to your wallet. I am staying in hostel on school campus and one day a fellow student who asked to see my phone went straight to my wallet, he succeeded to view my balance because I did not put it on password but he was so unlucky that he did not close all the tabs he opened on my phone. After I collected the phone I noticed he accessed my wallet and when I asked him why he did that, he said it's because of curiosity and that he is a Bitcoin lover and wants to learn but I asked him to go are learn from else where because am not telling him any thing. Some people don't have respect for others privacy and it's not good.