It's a movie about two children that become best friends and fall in love in the for bidden to see each other or play with each other one child likes magic grows up to be a magician and they fight they secretly take their own death just to be together

The Illusionist (2006)

From Wikipedia: Eisenheim was born to a peasant cabinet-maker and became interested in magic after meeting a travelling magician. He also fell in love with Sophie, a duchess, but the two were forbidden to see each other on account of the former being a peasant. They kept meeting secretly but were caught one day and separated by force.

https://en.wikipedia.org/wiki/The_Illusionist_(2006_film)