All the suggestions are very good. For me its also a mental decision. After going through a lengthy (as in over a decade of waiting) I just told myself one night. On so and so day it will be the end.
And I realized that as I buried myself in work, activities and focused on the people who have stayed with me and held my hand. The day arrived when he called I said "we had a good run good bye" and placed the phone down. Now some people would say its harsh to break up with someone on the phone but for me that was that after years of waiting and discussion ... he knew what was coming.
On hindsight, I also realized with so much shared memories he was probably just being polite and it was up to me to end it. So I did and then a full two years later Michael shows up on DnM .... and that's when a better story started.
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Meditation has always been an excellent method to clear a persons thoughts and live in the moment.