In California some years ago we elected Arnold Schwarzenegger as governor. He started out with a fairly conservative agenda. Then he started caving to the dems at every opportunity. Turns out he was being overly friendly with the hired help and managed to produce a child whom he does not appear to have wanted to acknowledge. The child's mother spoke with Gloria Allred. As soon as he was out of office a massive settlement was paid and the rest is history. I wouldn't be surprised to learn that Jeff Sessions has been suffering from acute Arnold Schwarzenegger Syndrome for the past two years.
I don't question the guys integrity, but his political sense. There was a lot of stuff going on behind the scenes early on we don't know about. McConnell told Trump he wasn't going schedule a vote for a new AG for a year if he fired Sessions. It is been rumored that Sessions had tenured his resignation before and Trump decided not to except it. By early this year he had to know Trump-Russia collusion was a hoax and resigned. He should have left when the Fusion GPS, Strzok/Page texts, and McCabe news started accumulate in early spring.
At some point McConnell had to know this was all B.S and gave Trump the go ahead or some options. The Senate was trying to get as many judges confirmed as possible along with Kavanaugh. When Kennedy announced his retirement at the end of June, firing Sessions was likely a no go..