I'm smoking for about 5 years now.
My girlfriend wants me to quit, becouse it bothers her a lot

I had two uttery bad attemts to quit, no success...
I only stayed clean 2 days and then came the craving...
I was extremly jumpy and angry for no apparent reason, I was a FREAK!
I made her cry a couple of times, and I was very ashamed of myself

Then I started smoking again in secret, and things calmed down...
Now she is starting to find it out, so I have to quit if I don't want to loose her for sure...
HELP!!!!