Girl I really want to be with just cut things off when she found out I watch porn

I really wanted things to work, I told her I would stop but she made up her mind. I didn’t want to make excuses but i only watch it when i do cocaine and I told her I would stop snorting. She left my apartment and slammed the door. I’m still willing to stop watching it, what do I do? I just want her to trust me and want to be with me again