....

Imagine a head of a mafia giving up on a relationship with a civilian.

But I think Norio would still be the best choice, he is powerful and he can lear to control his power, besides he is simple and honest enough that he would not have second motives and will always be on Kuminasa's side.

I agreee! Why can't they just be together ヽ(`Д´)ﾉ why can't he just teach him how he should be start with the basics... I know it's hard to change someone but he just gave up without even tryin(╯°Д °)╯╧╧

Kunimasa probably doesn't want to corrupt Norio because of his purity and innocence. Kunimasa is doing what he thinks is best for Norio, because Norio is the way he is, Kunimasa thinks he will be crushed under the weight of being the 'wife' of a "mafia boss" (borrowing from the mafia boss and civilian analogy).

Yes, but that's an objective view, and kunimasa has a subjectove view, much less clear. My interpretation of why kunimasa broke up with him was largely because he didn't want to subject Norio to the pain and trials that come with it, especially since norio didn't really expect it. It's one thing to think that someone could do it, even if it'd suck, it's another to want to make them go through that. And you don't always see the one you want to protect clearly.

Also the burden of children, the only point I think were lacking in all that

If you think about the abuse, controlling behavior and head screw the poor guy went through with his one parent, you'd be a mess too. Part of the reasons why he didn't want to hurt Norio... and a little info on the jaguar.... http://www.nhptv.org/natureworks/jaguar.htm