because rin like sakuhora liked the cool "arrogant assshole" guys, kakashi was the sasuke of the team, obito was the naruto of the team.
there mustve been a hinata out there for him.
I'll tell you something about me, I to had a sakura and a hinata "truly" i however am a combination of sasuke and naruto + oro "also true" as long as the sasuke part of me was strong they both loved me fiercely, but when life crushed me beneath its wait, and saw that arrogance was meaningless in the face of its reach, the sasuke part of me slowly dissappeared and my sakura lost her love, but my hinatas love only grew stronger - its been 5 years and im still with my hinata.