I've followed your story too OP and I have to say, I've never altered my conclusion, even from before your most recent threads.
A man who waits until a new love interest turns up to leave his marriage, is rarely a sound proposition. I can't remember if you ever cross-checked his account of a dead marriage with the wife he left, but in essence, he sounds like a walking cliche - leaving his wife for a young student.
Regardless of your post-graduate status, there is an imbalance of power when a tutor gets involved with a former student. This is further evidenced by the awe in which you seem to regard him, despite the flaws that many of us can see here most vividly.
His behaviour is astonishingly controlling and I suspect he knows that he would not be able to get away with it, were he in a relationship with a woman closer to his age.
I think with the benefit of hindsight and a few more years, you will look back on this relationship with some distaste, as well as sadness that your own naivety allowed you to collude in infidelity.
Cut your losses with this man and spend some time on your own being single and enjoying your youth. Discuss the relationship with people close to you, who can give you an objective view about this relationship. I imagine that family and friends have been harbouring concerns for ages and will be relieved of the opportunity to share their disquiet.
I imagine if you were to keep tabs on this man (not advisable, but easy to do) you will find that he will have several more relationships with young women who are easier to manipulate and control - and who will hero worship him, until they have no life and friends of their own. The moment they rebel, if they do, he will behave exactly as he did with you. Pity them - and warn them if you can.