You can say he is in probation period. Isn't it funny you have started thinking to change him and so there is going to be many incidences, you can tell him " you are not that person which I met"
Its hard to specify characteristics of a men who secretly hates women but in general self centered people those worlds are limited to me and myself start hating all others both(men and women) if not according to their liking. :)
some guys start hating all women if they dont succeed in getting a woman even after trying super hard. Some guys have bad experience with girl/girls start hating all women.
these kind of guys give sign if someone give little attention, can easily find out. btw these guys dont believe in humanity
RE: Do we ever change really.
Time change everything.