I'm not sure I'd trust the word of a cashier at a pet store about pet care -- we've seen people get some awful advice from store clerks over the years.
The first thing you need to know is that you need another pig. They're herd animals, and they do much better with another of their own kind. However please don't buy another -- there are plenty of homeless pigs in shelters and rescues that need loving homes.
Here's a thread to get you started on pig care:
https://www.guineapigcages.com/forum...nea-pig-owners
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