My girlfriend is afraid of getting pregnant?

My girlfriend of more than a year and I had once, but she won't do so again because of her fear of getting pregnant. I know her fear is reasonable to some degree, but she won't have even if I pull out while using a condom. Our ual relationship is not fair in the first place, with me doing pretty much all of the in bed, and its been 4-5 months since we had . Is her fear reasonable? I have a terribly strong drive, and my frustration has me on the brink of breaking up with her.