I did not quite get your question - if you want to have stories about amnesia, I have a short list for you: http://www.mangago.me/home/mangalist/205541/
I literally meant one going amnesiac and then his partner getting hurt emotionally cause of the amnesiac guy's behavior towards him. Thanks for the list though. (づ￣ ³￣)づ
Super Lovers. One character gets amnesia twice!
The second time, it's hard on the characters love life.
Gimme some yaoi with the uke/seme going amnesiac. I like seeing the other partner getting hurt emotionally so yeah. #－.－)
Also I've probably read most of the popular ones already.