I was thinking about this just this morning!!
I identify publicly, politically, etc. as a lesbian and have for almost 40 years. Personally, in my heart, in terms of desire, I often feel more like a gay man. Given my gender identity as non-binary, I'd probably just say that "personally, in my heart," I identify - in terms of sexual orientation - as bisexual. But, since I've been with the same person for almost 20, I do consider myself to be in a lesbian relationship, no matter my personal identity.
Yeah, a bit convoluted but I think that if we're all (cis, trans, questioning...) honest with ourselves, we're probably all bi to some degree!