To "consult with" someone means to talk with them in order to get help making a decision:

Consult with a doctor if you think you might have some kind of health issue.

I need to consult with my manager before I can agree to that price.

When someone is supposed to discuss an issue with someone, but doesn't, use the phrase "___ without consulting with ___":

In the future, don't make any purchases without consulting with me please.

You can also say "without consulting (someone)":

How could you buy them without consulting me?