My ex's (son's father) new girlfriend does not allow him to talk on the phone with me?

My ex’s new girlfriend has a ridiculous rule that he is not allowed to speak on the phone with me about issues concerning our son. Rather, we are only “allowed” to communicate via email or text. This really makes communication difficult and I think it is incredibly ridiculous, but yet he abides by it because he is being completely controlled by her.

I am venting for the most part, but does anyone else find this ridiculous?

This is only a fragment of the ludicrous things that I have to put up with (not to mention my son accidentally calling her “Mommy” sometimes and her telling him that she “likes it when you call me Mommy”). I am not after my ex, I have a new boyfriend who I am crazy about, and she is a controlling insecure b*tch!