i have a female guinea pig that is 4.5 years old, and i had her since she was a month old. she lives alone ever since. i didn't know you should keep guinea pig at pairs and my cage was too small for 2 guinea pigs. now i have a new big cage and i want to bring her a friend, but i'm afraid they wouldn't get along since my guinea pig lived alone her whole life. i spend a lot of time with her, but i think another guinea pig would be the best for her. should i get another one?