What if 당신 and Loki were in 사랑 but then he had amnesia and forgot all about 당신 and nothing could help him remember (I mean nothing)

I would do everything I could to get his memory back. I would make sure that nobody found out he 로스트 his memory.

Try to be as nice as I possibly could be, still being in love, but not smothering the poor guy 또는 killing myself. If he forgot that he loved me, that would hurt, but it wouldn't have been his fault with amnesia anyway, so I would just try to continue being there for him.

i would do eveything in my power to help him function a normally as possible and get his memory back

I would start all over from scratch and build our 사랑 anew, I guess. It's hard to imagine a universe wherein Loki-dono would fall in 사랑 with a loser like me even once, but hey, in this amazing 판타지 world I guess it could happen again...

I'd kill myself.

i would do it like they did in the vow- i would make him fall in 사랑 with me again

I'd teach him how to love,( in every way) then I'd somehow get him attracted to me...

rebuild the relationship.
start out as friends, I don't care if he's doesn't 사랑 me, if we're best friends, I'm content.
and if it does not work be nicer.
and if that does not work then screw loki I'm moving on to Captain America :D
^ jk