Sorry new here and haven't read anything but up to this post.
I am bisexual. It was something that I acknowledged in the midst of a long term relationship with a man. I found it important to acknowledge because it put some historical situations into context for me and made me realise why I behaved the way I did.
I also acknowledged that some of my presentation is directly aligned with my sexuality. The things I like to wear, I do, because of the symbolism.
I split with my ex for reasons totally unrelated to coming out as bisexual. We have children. Now I am with a woman. It is important to me that people who know us understand that I am bisexual because I don't want my former relationship to be seen as a mistake, or a stepping stone. I was very much into my partner, in all the ways I am into my new partner. I didn't feel compelled to be with him to conceal who I really was. I am bisexual. Any partner who wants me to hide that isn't for me.