21 yr ruining my relationship

Hello y’all.
It’s a big step for me to come post. I’m in real need of guidance. I’m a 21 yr old ginger male named Seth. Ginger is irrelevant but nevertheless I like being a ging and it being known. I have been using porn since I was 7ish. Started off with just anyone in a magazine. Then I found my family’s playboy stash. From there it quickly escalated when I got my first internet enabled device. I don’t do drugs or anything so PMO is how I relieve stress and such. Mostly to cope with my depression because my medicine isn’t enough. It never used to impact my life until I got with my fiancé a year ago. I used to be sly about hiding it and then feeling guilty. I have been caught multiple times and it breaks her heart because she thinks she’s not enough and categorizes it as cheating. To me it is not. And I cannot stop. I try and try but it’s so stressful in my life and I hit a low point and I go incognito and PMO. She just went through my Browser history on my iPhone and found I had some evidence last month. It caused a huge fight and I told her it is an addiction and that since our past fights about it I’ve been trying really hard to stop. I cannot though unfortunately so I’ve found NoFap. I come to you guys a desperate fellow. It’s destroying my relationship and she feels that it’ll lead to cheating. Like in real life. I know that it won’t but still that is no excuse to not stop. I need help bad. I don’t know where to start or what to do. When my mind gets me down I load up the internet and get right to it and feel regret right after. I think my PMO really skyrocketed after I went sober. I used to not be a good kid. And in February I had emergency Splenectomy. I quit smoking cigarettes at that point as well so I didn’t have a coping mechanism anymore. I don’t want to go back to other ways to release what binds my mind. So I ask as a man for help guys. I want to quit cold turkey just like I did Drugs, Alcohol, and Tobacco products. I don’t want to lose this relationship. I am reading the How To Use NoFat document right now doing the steps. Thank you for your time.
Cheers,
Seth

 

Thank you,
I will definitely give that a look over! I’m really hoping to make progress over this long journey!
Cheers,
InhumanSeth