Should I get a friend for Nacho?

I got a guinea pig, Nacho, a couple weeks ago and he is very shy and not very playful despite all that is offered. I was wondering if I should get him a friend but I’ve heard conflicting advice. (btw the cage set up was not permanent and he now has a hutch and is out most of the day in a large playpen). My fear is that he would not get along with another but he was housed with others before at the pet store.