Im sexually confused

I never questioned my sexuality at any point in my life, I always knew I liked boys and boys only. But recently I’ve found myself girls more than boys in a romantic way. I see myself marrying a girl even. I have a boyfriend and we’ve been together a long time, so Idk what to do. I still love him with all my heart and I don’t want to break up with him, but I can’t shake this feeling that I’m meant to be with a woman. I’ve never experienced anything with a girl, I’ve kissed one, but she was my best friend so it was just weird. I feel so confused and I’d love some guidance.