hes trying to manipulate you
its good that youre at least trying to help , but if he continues to turn you down and wont talk things through then you should try to cut ties with him
he shouldnt be doing this to you , acting like this just because you rejected him
i get that he may be upset but this is going too far
of course , whatever you do is up to you
just what i think ,,,, (mostly speaking from experience)