Well, money is always a weird issue, especially if you are not married.
Well, I've never BEEN married, so I am only speculating about that. But in normal dating/living together situations, I've never not had financial issues be super awkward to deal with, so what you are describing doesn't sound that strange, even if it is unfortunate
It could be that instead of him not caring, he simply doesn't know how to proceed forward. Like, he might just have needed some time to think about things, and was bad at communicating that.
How is your communication otherwise?