I think blocking the number is the route that i would go.
Once i am able to physically live in a separate house from my Addicted Other... i will give AO one chance not to abuse the priviledge of having my contact #. Once he abuses it. My number will change and he will only be allowed to use email to contact me.
Hopefully your EX will get the message with you not responding to her... and will stop sending you texts.
Carrie