My 5 month old kitten passed last night

My old apartment complex had a bunch of strays, many of which were females who had yet to be spayed. Ive nursed a few mama cats and their young for the first few months or so of their lives. I live in a city with packed shelters and im a pretty strong believer in anti kill shelters, so once the kittens are eating, playing and walking fine, theyre introduced to the rest of the complex.

Point is, i ended up keeping the sickest of my last batch. She was sick to the point of needing to vottle feed her as the mama cat had neglected her. She thankfully recovered and ended up getting attached to me and vise versa lol. Ive moved apartments now and she seemed to have liked it much more lol, bigger than our last place. Last night i noticed her too late, lack of energy after eating was common sure but when i went to move her to the couch i noticed she didn't hold her weight. She passed within the hour. It hurt, a lot more than any other pet. I feel this empty around and i would hate to replace her but it feels like too much to hold right now.
Im debating getting a new cat. Id rather not get so attached againbbut i dont think I can handle coming home to an empty house again.