我怎么说 - What I Say

Have you ever worked with someone so full of himself, he wouldn't take any suggestion from you?
Well, I have. In fact, I am currently working with him as a team. He never share anything he knew, even made decision without telling me.
Not trying to be femme here, but darn, it's a team of two. When one of the members decides to think and acts by himself, it's a big problem. That's not what a team means, is it?
Let's see, if this continues, I really need to talk to him personally before this go on our way and becomes a big problem later.