Female Betta fish staying out of the water.

The female started jumping to get itself sucked to the glass outside the water. Strange behaviour. At first, I thought it was because of the male. But the male betta is so peaceful and never attacks the female. I even tried removing the male. But the female Betta continued this behaviour. I did not worry much because betta fishes are able to breathe outside the water as well.
After a few days, the female got sick and died.

[@FindingPneuma]

Why does it do this?

[@interstellarguy]

It was trying to get away from the male.

[@sandraprpic7832]

I have the same issue but my fish is alone in aquarium why does it do that? Should i be worried???

[@interstellarguy]

yes, it will die soon if it keeps doing this. try adding some plants or hiding places in the tank for this fish.