How to unsync contacts from a phone?

Hi guys, so I recently added my gmail account on my girlfriend's phone in order to play Pokemon Go on her phone. This synced all my contacts onto her phone, which I should have thought of before. Is there any way to add my account there without syncing all the contacts, or alternatively, since I only need to do it every once in a while and for a short while, is there a way to add my account, deleting it when I'm done and then somehow unsync the contacts? because I removed my account from her phone, but all the contacts are still there. Thanks in in advance.

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