How did my girlfriend's ex do this?

My girlfriend was looking through her phone settings today and found that her phone's location was being shared with her ex's iPad, her ex that she dumped two and a half years ago. She'd got a new phone and number since the breakup and has had no contact with him. She knew it was his iPad by looking at... show more My girlfriend was looking through her phone settings today and found that her phone's location was being shared with her ex's iPad, her ex that she dumped two and a half years ago. She'd got a new phone and number since the breakup and has had no contact with him. She knew it was his iPad by looking at it's address/IP address and recognising it.
Since they've had no contact in over two years, neither of us can imagine how he got her number, so we're both pretty freaked out. Any idea how this could have happened? I'm telling her to let Apple know as well in case there's been any weird activity with her account that could provide answers.
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