It's lonely to keep a chipmunk.
If the chipmunk keeps only one, it will be lonely, because the chipmunk is a social animal and needs more company, otherwise it is likely to be depressed. If you only have one chipmunk, the owner needs to spend more time with it.
As long as the owner can accompany the chipmunk every day, it won't feel lonely. If the owner can't guarantee enough time to take care of it every day, it's better to keep two chipmunks so that they can keep each other company.
It should be noted that the breeding speed of the striped mouse is very fast. If you don't want them to breed, you'd better choose two same-sex striped mice to keep them together to prevent them from mating by themselves after estrus.