There is a lot of speculation of why the guy has gone through a change in his treatment of Trishna, but the clue is pretty obvious. The confessions between them when she says she had an abortion was the turn around. He had high plans for them and said he would tell his father about the two of them continuing. Even an open society a GF telling you she had an abortion and not tell you would be an ending to it. But this is lot more restrictive society and add a class system to it. He decided she is not marrying material anymore, I was thinking he abandoned her when the apartment was being leased and that he would not contact her again. But he decided to use her for his fantasy since she wasnt going to be his wife and she was docile enough for that. It was cruel to do that but he felt stabbed in the back for not being notified. She doesnt communicate well, as she also didnt tell him when apartment was being leased. She sensed there was no more love but continued to serve him as she was thought in the society. Which drove her over the edge as the mind cont comprehend both things.
