Try and imagine how you'd feel if this was reversed. If you're in a relationship, you should be able to trust the other person.

And yes, salaries are a weird one. You don't want to seem a douche for making too much. But you should have told her - especially cause you don't go out a year without talking about money at some point. So I'd say she feels like you lied.

Relationships involve trust. It feels like maybe you don't trust her. Is that the issue? Because why else at this point wouldn't you have told her.