Hi, nice translation but there are a couple of things that need fixing:

1. She said, "I leave at two
Memories of old fade with the new

should be something like:

Ella dijo, "Me voy a los dos"
Viejos recuerdos se desvanecen con los nuevos

2. we became one but now add up to two

should be something like:

Nosotros fuimos uno pero ahora sumamos dos

I'm not a Spanish speaker so this might not be great grammar, but I hope it makes sense!

Thanks :)