Is Bernie Sanders preparing to run as an independent if he isn't nominated for President by Democratic Party?

As I was reading the previous article that Bernie Sanders loyalty to the Democratic party is at best tenuous because mostly he has been running and winning for years as an Independent in his home state. So, it might happen that if he isn't either nominated for president by the Democratic Party and isn't nominated for Vice President under Hillary that he might well run as an independent against both Hillary and Trump. It is difficult to sort all this out but this might just mean that Bernie will be the vice presidential nominee with Hillary at the Democratic convention to avoid all this.