LadyWithLapdog
You're married and you choose to have joint finances and that's fine. Some people choose to have separate finances and that's fine too. Others choose to have some shared and some separate,and that's also fine.
At the moment,the OP and her DP aren't married and both have independent savings. So it seems like the only issue is that he has a lot in savings. If he didn't save, would everyone saying he should account for how he spends all his income after bills are paid? Would they be saying that he is lying by omission if he fails to declare that he bought himself a nice watch?
I agree they should have a conversation about finances and how it would work when married. I just don't agree that there's anything untoward about two adults with separate savings not giving each other updates on the independent elements of their finances.
AppleJane
It's not a stretch at all.
I don't think financial openness means someone would betray their friends' confidence. I couldn't care less how people structure their finances. Not everyone who has openness and shared finances goes on about 'we have no secrets, why would I be with DH if I didn't have total honesty about everything'.
It's those who smugly witter on about how they don't have secrets,tell their DH everything, that they divulge everything without question because their relationship is so trusting tend to (in my experience) also think nothing of telling their DH in detail everything that was said on girls' nights out, or their friend's difficult situation.