The final decision when I decided to leave my ex fiancé was not made over night. He had always been an alcoholic but eventually moved on to smoking heroin. Eventually I took a tool I learned in SMART Recovery and applied it to my relationship. I folded up a piece of paper into quarters. On the top half I listed the pros and cons of staying in the relationship. The bottom half consisted of the pros and cons of breaking off our engagement. It quickly became apparent leaving was worth more to me long term than staying in a destructive relationship.
I didn’t just sit down and made the lists. I carried that paper around for a week adding to it as new ideas came to my mind. It also gave me a chance to mull over my choices before making a final decision.