omg im so sorry. the passing of sugar gliders can be so hard because they are so delicate that you might think that any wrong move you took could have led them to pass. I know how it feels... i had my glider, pixel, pass away suddenly at only 6 months old. I thought she was just tired because she stayed up all day... but shortly after, when i put her in the cage and got some treats, i turned around and she was dead. I hope you can recover, he looks so cute. RIP