Now, my fiance has a male best friend. He and his best friend have been raised as next door neighbors, went to middle and high school together, started a business together. They see eachother 2-3 times a week, talk daily over the phone for hours (usually work), play video games together etc. So (I assumed) they are really close. I have never actually went out with them EVER since my fiance doesn't think we'll get along and wants guy time. I've met his friend many times (when he comes to our house) and we honestly have nothing in common, so I get my fiance's perspective (he and his friend have hobbies + a business which I know nothing about/not interested in). If we drew a venn diagram his friend would be in one bubble, me in the other and my fiance in the middle.

Now I've asked my fiance how's your friend doing multiple times (general politeness), and he always answers IDK. I never really understood until he explained to me that he (my fiance) doesn't care about his best friend's personal life and vice versa. Like?! What are friends for?

I know they talk about their business, economics, successfull companies and their mutual hobbies such as video games (games, companies, computer stuff), and cars/bikes (mutual hobby) but I can't understand how they never talk about their personal lives (it's one thing to not share relationship problems), but to never share information about personal lives - like hey we went to a nice restaurant or we're thinking of buying a house it's something I can't understand at all. It took him 3 months to tell his friend that I inherited property and we'll be moving soon (same city) - it's huge news!

His best friend is finishing his master's degree, and if I ask my fiance how his friend is doing, he'll tell me he doesn't care. Like?! A master's degree is HUGE. Fiance finished his last year.

I've posted in the past and was told that they are "dating" and "gay" which is not the case. Please don't comment that.

Question:

Is it normal for best friends to not talk about personal lives? I'm not asking for problems and drama, just about their personal lives outside of work and mutual hobbies.