Do you think that this scenario is wrong and disgusting or is it understandable? why?

Okay there are 3 friends... Rin, Kakashi and Obito who are aged 12. Now one day they decided to go out and Obito got trapped and as a dying wish he said to Kakashi to take care of Rin ( a girl Obito fancied) So couple of months later Rin and Kakashi were on a mission where Rin was being controlled by the enemy so Kakahi had no choice but to kill Rin.

30 years later Obito comes back, confronting Kakashi that he wasn't dead but was injured. Obito starts a war In the name of Rin - As a dying wish he told Kakashi to take care of her, which he failed.

NOW ... is it wrong for a 40-ish year old man to still think about Rin who died at the age of 12... keeping in mind he loved her when they were 12 and she then died and he still thinks about her...

Personally I see no harm.. Its love from childhood ... just because someone dies it doesn't mean you stop loving! this is what you call true love

--- Note this scenario is taken from an Anime called Naruto..