Not sure where to start or end, WAW - #2

[john28]

I need some advice on how to phrase that I don't want her to call me anymore except concerning our son. I want to seem confident, and not weak in a way that I don't want her calling me "because it hurts too much". That's not what I want to say, and that's not how I feel. How should I phrase it without being mean or harsh, yet understanding and stern? Something like:

"W, I've been doing some thinking, and I would prefer if you only called me about matters concerning our son from now on."

If she asks why.... "It is just how I feel right now."