So I have 2 sugar gliders one is a male and one is a female. My female has started pulling my male by his tail across the cage and she never done this before. They go to sleep cuddling with each other but at night she turns mean. This just started and they are both healthy so idk y she's being a bully. I rlly didn't want to separate them is there anything I can do? Why is she all of a sudden showing agression when she was just fine with him before.

I can't tell you why she is bullying the male.
we have a small pocket pets cage we keep empty in the back room. After a few introductions we did have a few gliders get more aggressive to the new gliders at times. If it got to bad we would FOR ONE NIGHT put the aggressive glider alone in the small pocket pets cage. Then put them back together in the morning.
At times this seemed to work ok.

I have heard of glider that are sick can get chased by their cagemates. maybe a vet visit is needed.