Was this not already established about Bela in earlier seasons?

I might be totally off here, especially considering what happened in the last episode, but I feel like I'm losing my mind. Wasn't it already established that Bela is Bi? I haven't rewatched the older seasons recently, but I remember her being Bi, so I was confused about why it was such a big deal that she kissed a girl for the first time and why she was coming out. #MandelaEffect?