With Khushi, Khushi knows he shows emotions less. He tries to show it, but Khushi doesn't need all that to know what he's trying to convey to her. TO Khushi it just matters that he realizes his wrongs at the end of the day.
There's a huge difference in showing emotions to both of the 2 imp women in his life and it's completely justified the way it is. Just cause he cries for his Di doesn't mean that he has to cry for Khushi when it came to all the stuff he did with her. He felt GUILT for doing all that he did. He can show emotions easier for his Di- EVEN though he tries his best not too, he's a human at the end of the day, and he did today. He never tries to be emotional, this is ASR, but certain situations in life, that he's atttached to make him have his moments too. That doesn't mean just cause he doesn't cry for Khushi makes him any less of a hero.