I think I am having a similar thought process, even though our situations are different... I don't want this new, mean, horrible person. I want the person he was before! Where did it go? Is it dead for good? Was it never there and I just had 'salami slices in front of my eyes' (as we say in Italy!) because I was in love?
I suppose it takes some time to let go of what was before, especially if it all changed so quickly and so abruptly. And I definitely don't understand why he's pushing you like this. Obviously he's being very selfish - he gets something out of getting a rise out of you (maybe proof that you still care?) and the need to have that validation overrides the concern for your wellbeing...
Me: 26, BF: 33, R: 9yrs Bomb dropped April 17th 2014 Currently No Contact