Why is my ex's girlfriend trying to call me?

This new girlfriend is also his ex. I have her number blocked even though I don't know how she has my number in the first place. Yesterday she called me off her number, then restricted and then some number from an app. Today, same thing, she called me off of the app number again twice so I blocked that one too. What is the reasoning behind this? We don't like each other and the guy is a douche. I don't understand why.
Why is my ex's girlfriend trying to call me?
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