Smokin bud or Girlfriend?

So I smoke a lil bud from time and time and i have a old fashion girl who doesn't smoke and looks at marijuana like its a gateway drug and addictive and gonna kill you. So I talked to her about it and explained how you can't O.D its a plant from the earth. I tell her drinking and fast food are bad too and she does it. She met me during a session at her friends place so she knows i smoke. I don't smoke around her and i only smoke during midterms and finals, other than that its kinda rare. So she's annoying when she bitches, should I leave her cuz she wont stop annoying me about it and she wants me to stop completely but i don't want to cuz it aint a problem i just feel she's ignorant about it