This started when I was a teen and fell in love for the first time. I thought a lot of a person and ended up running out of mental images of them. The more I thought of them, and the more they (or their image) meant to me, the quicker I would run out of images. I still experience this. If I think a lot about a person, a few days/weeks after seeing them last I will not be able to recall their face, whatever I do.
I find this interesting.
Does this happen to anyone else?