What do you think I should do?

My ex is sharing a calling plan in my name but can't afford it and were no longer together. she had a choice. Drugs, drinking, and cigs or me. She picked the drugs and drinking. She I terminate the line?
Updates:
+1 y
should I* (thank you for your answers, now she wants to talk in 4 hours
What do you think I should do?
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