Go seek a profesional, tell him how you feel, how you are a junkie and steal. I know it may seem hard but im hoping it will be easier to you considering your talking to a stranger and he won't think any less of you because its his job to help you, tell your g/f that you've realised what you've been doing is wrong and that you want to get off this addiction and become a better person. Its going to be hard, but if you give this up now once you've over come this you'll see how much better your life is

Good luck man, MUCH love