I'm bisexual and in a relationship with a guy, but I still have thoughts about being with women. normal?

I have only had sex with one girl. I told myself that I would never be with another guy after her. But that fell apart and eventually I ended up with my boyfriend now. We have been together for 7 months. I love him and care for him a lot. I just still want to have sex with girls so bad, I can't help it. It scares me to think that I might never get to be with another girl again. Does this make me a bad person? Here lately it's just been getting worse. I'm just so much more attracted to girls than guys. should I feel bad?