His mum called you with a message from him, then he texted you? I'm sorry I'm not up to date on your story but I think niether of those things are supposed to happen according to some order, if I'm wrong stop me now I don't get US law.
If it's not supposed to happen, what are you supposed to do if it does happen?
Why is the order in place?
What is it protecting?
You don't need to answer those questions here, but I'm guessing he's not supposed to contact you in any way, even via a third party, for a reason. If you let it go you're giving him the green light to do it again and again and again.