How do I become romantic with my partner again?

I'm a PMO addict struggling with my addiction for ~20 years. Most of my relationships have never been significant. They never went well and usually ended quickly. Currently, I'm in my longest relationship that's been going on for 2 years. My partner knew about my PMO for a while and it didn't seem to affect the relationship too badly. That is not the case today. We have not been intimate for some time, and I'm feeling like I disgust her. It feels like things will definitely end if I can't get over my PMO addiction and become intimate with her again. We had booked a night at a hotel this weekend to enjoy a beer festival, and I had planned on trying to be intimate with her during our one night stay. But I ended up confessing to her that I relapsed several times within the past 2 weeks which sucked all romance out of the room. She's been slightly cold to me since and has looked down and upset. I don't know what to do at this point. I don't know how to reestablish trust and rekindle the flame. Has anyone been in a similar situation? What could I do to keep it from spiraling?