Syria has not threatened Jordan, It is Saudi Arabia, Qatar, Jordan , Turkey, Israel and so on who are arming the Al-gadea backed rebels who are the major fighting force. They are from all over the world and want to establish an Islamic khalif-ate and once they are in power they will be sending their terrorists gangs to Europe, America and other places. If the foreign interference did not happen may be they could have come to some sort of arrangement instead Syria has been destroyed , thousands killed and there is no light in sight. If Assad is overthrown then Israel has managed to get rid of one of its main opponent, the next stage would be to get rid of Hezbollah and move into Iran if they succeed.
Netanyahu condemns West Bank arson attack, calling it 'terror' (Haaretz)
from the article: Jordan vows to face down any security threats from Syria