We run into dude at the grocery store, eh, I'm not too concerned.

However, if dude is someone I drink with, trust not to be an ass, bring around my friends; I want to know some things about them.

And that's more where I am.

I keep a very small circle of people I hang out with, I entrust a lot to them and they to me and I need to trust the person that I'm gonna marry. Her not telling me isn't a sign of mistrust, it's just a level of communication that I'd have expected. But who knows aside from those two in that situation what their communication level is.