So sorry for your loss! Good for you for wanting to make sure that Issei is well taken care of and happy. It sounds like both of you would benefit from another glider. Depending where you're from, there are breeders you can contact, as well as possible options on Craig's list. Like BYK mentioned, there is a lot of information out there about proper introductions (separate cages for awhile, pouch swapping, and getting them used to each others scents). Wishing you all the best!