Arnie and Jose are very different people. Arnie gets everything he wants. Meanwhile, Jose needs to work for everything.
Arnie knows Jose is a hard worker. For that reason, Arnie wanted some cash, but Arnie didn't want to work for it. So, Arnie tells Jose that can find him some jobs opportunities if Jose splits 50, 50. Jose knew this was a bad dealt since Arnie would do nothing. Furthermore, Jose made the split 70, 30. Consequently, Arnie's going to get free money for doing nothing.
The Main idea is the difference between Arnie and Jose. For that reason, they both believe in different morals. Instead of helping Mr. Clemens Arnie runs away because he didn't want to deal with the incident. But on the other hand, Jose stays to help Mr.Clemens because he cares about things greater than himself.