27 yo enby lesbian?

Hello lovelies ^w^ First off, want to start off by thanking anyone who's able to give some input or advice, it means a lot. I'm a 27 year old nonbinary person (afab) who currently identifies as demi-omnisexual. I felt it was most fitting since I'm attracted to all genders but I have a preference for women. However lately I've been questioning my sexuality after watching videos of bisexual/pan people coming out again. Before I thought attraction was all around the same and the demi part of me was attributed to all genders, but I'm coming to find that its different for girls like the romantic and sexual attraction is there without question. The reason I'm having a hard time with this is because I'm currently with a cisguy and although he accepts me for who I am gender identity wise, polyamory is out of question. Some days are easy for me to acknowledge the life we have now and are genuinely happy, but other days I don't crave or want any of his attention and wish I was far away and with the company of a woman. I feel bad and want to find out if my sexuality has something to do with it and if so, how to proceed?