I have always loved the film "Eternal Sunshine of the Spotless Mind". I particularly like the idea that even if we are brain washed of the memory of a lover where the relationship has failed, there is a likelihood that we fall in love with them again. I expanded this to how we can brainwash ourselves of the misery of past relationships over time and blot out the bad times, much like vehicles can look closer in rear view mirrors, so can relationships and past lovers. No doubt this is why so many couples who have failed try again and again to make things work out. I had a vivid image of love having to be sucked out of the memory to purify the mind again, hence the reference to leeches placed on a forehead. I also had the concept of reversing the time of a failed relationship so that all the good times appear at the end and the bad at the beginning. Consequently, your final memory of your partner is the first time you met - 'Our final memory is love at first sight, our final moment that sweet first kiss'.