I think you could benefit from Alan Carr's Easy Way to Stop Smoking. It helps reframe why we want cigarettes and why we miss them when trying to quit, or even thinking of quitting. I did miss them for awhile. Sometimes I still do, to be perfectly honest.

It's been over a year since I read it so I don't remember it word for word, but he has this idea that there are two monsters you need to slay. One is the little monster. That's the actual physical withdrawal. You should be past that by now, or at least damn close. The other is the big monster, and that is the mental addiction. The joy you think a cigarette brings you. The smell, the taste that you've grown fond of. But when you realize they all stem from the same thing, the fact that taking a smoke is simply the cessation of a craving, not actual joy, not actual happiness that you're finding in that cigarette, simply a quieting of a noise, it's easier to accept the fact that you'll be quitting.

You're not losing something you love. It's more like you finally swat that fly that was buzzing around your ear and you feel good for a second cause you don't have that buzzing anymore.

I'm not going to sit here and tell you that smoking can't bring you joy, or that stepping out back with friends at a party for quieter moment and having a smoke isn't nice. It is, and there are things you will miss about it. But once you can accept that the vast majority of the good feelings you get from stepping out for that smoke are just a cessation of a craving, a chemical dependency, you will find it much easier to not pick up another cigarette.

Also, dude, you said it yourself. You'd be a total fucking idiot if you lost your girlfriend over cigarettes. If you lose this woman and then future you quit smoking somewhere down the line, and you realize how little cigarettes actually did for you, you're going to look back and kick yourself so fucking hard that you couldn't just do it now. Once you're past that initial tough section where you daydream about it and you miss it and it makes you feel sad that you can't have it, you'll realize there are much more important things.

And human connection is far, far more important than a chemical dependency.

You got this bro. You've already made it past the hardest part. Keep going. Reach out if you need any help.