It's really strange because most of the AR fans would agree that between the two it is definitely Armaan who craves more for some physical comfort and affection. So obviously he would be the one to get affected more if they ended up hugging. But on the contrary, it is always Ridhima who backs away which goes on to imply her weakness due to Armaan's physical proximity. She reacts as if she won't be able to complete what she's saying or might just melt and change her mind about the whole situation.
I just found it really interesting since I always thought Armaan won't be able to cope and let go of her if he ended up hugging her. But the actual truth might be that hugging her would probably give him more strength to move away and start again. While it is definitely the complete opposite for Ridhima.