Friend got back to his ex, said to me that he ain't having time for pokemon go because he wants to beat up his ex's ex cause of he said mean things to her after their breakup, I said to him that he shouldn't be doing this, he's giving too much fucks but he's now in some sort of rage mode or something and no reason will make him change his mind

Am I right or not? Never been in this kind of situation so I want to have some RP perspective

sorry for poor English