Getting someone else s notifications on my iphone?

So, a few months ago (before I had an iphone) I frequently used my boyfriends iphone to instagram pictures. Later we broke up and I purchased my own iphone. However, now I get notifications from his facebook friends saying "your facebook friend 'john doe' had joined instagram". How do I make it stop?

--mega face palm--- log out of his Facebook. Freaking idiot. -.

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