So, I watched this anime movie a long time ago. I can barely remember it. I remember I loved it. It has something to do with a you boy, and girl. The girl was with this man. They boy&girl fall in love. In the end the girl turned out to be a robot, and their world was exploding, so she had to stay to do something about it, saving the boy but killing herself. Does anyone know what movie I'm talking about??

"a long time ago"
Would you care to give a more meaningful description?
By the decade possibly?

Anime
A boy and an Android girl
Android girl saves the world by sacrificing herself

Possibly,

Metropolis (2001)

view trailer

I don't remember. I was just very young &i just remembered it today. Um I guess around 2002 was when I first saw it, but not necessarily when it came out.