Remember Trump said he and Pence had the same thinking? Why did Trump pick Pence to be his VP in 2016? Did he choose some random unknown guy that had a few ties to certain people?
Trump knows Pence better than any of us. Pence had a role to play. Remember what's coming, it couldn't have happened to the fullest extent if Pence didn't "betray" Trump.
Pence could be doing what's best for the country so the Military can come in.
Pence was placed as the VP by Mannafort. They needed someone who could help with the evangelicals and that could help “balance” out Trump.
Pence has been the most loyal person in his orbit, asides from his children. He had no other choice than to go along with what happened on the 6th.