Ack! This reminds me of Revenge of the Sith

Primarily because I made the mistake of watching them back to back without a break. But-you've got two groups that forbid marriage (The Jedi and Catholic Church) one young guy being exposed to evil, and becoming more and more evil himself because he somehow thinks he is doing the right thing, and a dead young woman at the end as a life changing experience. Only Gael García Bernal does not fall in a volcano and get cool respirator unit. I really should take breaks between movies.....