why do you still wonder why she did that?
If I were you, either live with it or move on your own.
You don't ask "why you don't love me or why you don't trust me" if people don't. You can not change people, the only one you can change is yourself.
As a father, you should think about them before you make any decision include beneficiary.
Here is a question you might ask your wife: "What happens if both of us die in one accident and kids won't?"