I withheld something from my partner.

I kept something from my partner. I'm a 22-year-old woman, and I've been with my partner, who is 21, for over three years. Recently, I decided to come clean because she was starting to become suspicious. She generally feels uncomfortable around drugs and alcohol, and a few months ago, I tried a couple of zyns over the course of a couple of months since a friend was doing it. It wasn't a frequent occurrence, and I stopped after that. I hesitated to tell her because I didn’t want to upset her, especially since I’m not addicted or anything. She has previously expressed that she just wants me to be honest with her, even if it makes her uneasy at the moment. In hindsight, I realize that if I had just admitted it right away, it might not have been as big of a deal. I found myself caught in a dilemma about whether it was better to be honest or protect myself, and I now see that lying was the wrong choice. I know this situation isn’t just about me, but I am truly heartbroken. She means the world to me, and I can’t understand why I made such a poor decision. Now, I’m dealing with the fallout after six months of keeping this secret. I acknowledge that what I did was wrong, and she has every right to feel hurt or betrayed. I just don’t know how to move forward. It’s frustrating because if I had just owned up to it sooner, I would have avoided complicating things. My instincts to protect myself over my relationship led me here. Now she’s having a hard time trusting me, and I can’t shake the feeling of disgust toward myself. I pride myself on being honest in our relationship, so this lapse in judgment is particularly troubling. She doubts that this is the only thing I’ve kept from her, which is understandable. I’m at a loss for how to support her through this. Has anyone else been in a similar situation? What can I do? Thank you for any advice. TL;DR - I lied to my partner about something relatively insignificant over an extended period to save face, and now I’m grappling with the consequences.