Why was Jarvis so angry at Ryan? Was Ryan the one to blame?

Ryan was not there for Jarvis when he needed him the most at a time of crisis. It can be said that this was Ryan's fault that Jarvis was now in trouble with his family over something so petty. Ryan should have been a better friend to him regardless of whatever was at stake for him personally, it does not justify his behavior towards Jarvis' plight.

Hope that answers the question, have a great day!