Sounds a bit like he's used to behaving around women he finds attractive, who aren't used to being around men they find attractive. It is fairly common for men who are still attractive in their mid 30s and onwards to behave like this; the confidence, notably. When he kissed you, you should have told him that it makes you uncomfortable, he has a wife and should know not to take advantage of people in a place of learning where he has a position of authority.
I would estimate with 97% certainty that he doesn't feel anything other than sexual and perhaps a little intellectual lust for you, and would wager my favourite hat that he has done that or something similar before.
Explosions is right when he says you are just his bit on the side. Amongst others, I'd imagine. Probably right in his element as a lecturer to tens / hundreds of girls every year.