What is the anime called where a spaceship crashes and young boy girl are about to get married but saved They go separate ways after she becomes singer he warrior?

The anime you're describing is most likely "The Vision of Escaflowne" (also known as "Escaflowne: The Movie").

Here's why:

* Spaceship Crash: The story begins with a spaceship crash landing on Earth.

* Young Boy and Girl: The main characters are Hitomi, a young girl, and Van, a young boy from the magical world of Gaea.

* Marriage: Hitomi and Van are initially intended to be married to maintain peace between their respective kingdoms.

* Saved and Separate Ways: They are saved from their forced marriage and go on separate paths. Hitomi becomes a singer, while Van becomes a warrior.

Other Details:

* Romantic Elements: While not explicitly a romance, there is a strong romantic connection between Hitomi and Van.

* Fantasy World: The anime features a magical world called Gaea, where giant robots known as Escaflownes fight.

If you're interested in this anime, you can easily find it online or at your local library.