What do you think of me arguing with my girlfriend alot because she isn't romantic?
That sounds bad. Have you tried being romantic first?
I've tried to be romantic but every time I do it she says it's not good enough and accuses me of lying to her.
I know you're upset, but you shouldn't just expect someone to change for you like that. However, if it bothers you that much you should break up with her.
I can't break up with her. I love her.
Then you need to talk to her. You can't expect her to change. So either you accept her or you end the relationship.