After dating for so long, he didn't even know that his girlfriend was a boss... It was a sadistic sibling relationship. The 35-year-old girl met the 25-year-old him. He just wanted to love her well, but she guarded him like a thief. I love you, but I can't be with you... Loving someone deeply starts with "letting go".
Who said "sister-brother love" is unreliable? It's because of insufficient fate.