Ok well I was with my glider at just now and he usually doesn't bite unless he thinks I'm food but now he was really calm and just slowly trying to bite and I just kept on working with him just trying to softly rub him head to show that I'm not food and he even tried to bite down hard. I didn't put him in his cage right away but shortly after I did, not because of the biting, but because it is late and I was going to put him back anyways. Why do you think he was biting now when he normally doesn't. Maybe it's because it's night time? He rarely ever bites.
it could make things better. he will be happier and if he sees her not biting you he might follow her example. and maybe being alone is getting to him and is causing him to act different. could being neutered help stop the biting since it will make him less aggressive?