The reason why I love this pairing is easily because they've cared about each other and would fight side-by-side, Rin's risk of suicide to oppose the enemy she was captured by must have left Kakashi heartbroken. In a state of despair he would always mourn by her grave after that day.
Rin to me is the only woman I can see Kakashi purely having a heart to love, but that's just my opinion.
Characters (c) Masashi Kishimoto
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