forgive me for the length of this post, but i am at the point of desperation. long story short, i have had a complicated relationship (friendship to romantic to friendship to ???) with FP for about 5 years. i have had the revelation quite recently that my limerence and blind devotion has consumed my mind to the point where it is debilitating. i can no longer cope. FP has found a new prospective relationship with another person, after telling me they wanted to try to work on our relationship (but they would go back and forth on the matter up until now). FP had another relationship after our’s, which ended then sparked their desire to try again with me. i can’t hate FP, and still dismiss any negative/unsavory thought i have for them. my genuine love for FP overrides, and i can’t help but wish the best for them, even though i hoped for so long “the best” would be with me. i haven’t talked to/dated/slept with anyone since (~3 years). my hope that FP would return my feelings was shattered, but i appreciated their honesty rather than living in constant confusion. FP has told me to let them go, even though they still love and care about me. 

***How do i sweep up my shattered hope instead of trying to glue it back together again? How can one break limerence instead of going back to a state of reverie? 

TLDR: Long-term complicated relationship with FP needs to end, asking for any advice to break FP mindset.