I felt a tinge of pain in Neil. It was like that last bit of sadness for the person she had been to him, for what they had had 5-6 years ago. It was more like regret mixed with sadness. But it was not the feelings of all those years ago. She ruined it by lying to him, using him, his wife and his family. She killed any feeling he had for her or her memories.
When he said about "finding the bullet from Juhi's Body" Neil hesitated. You could feel his internal turmoil. He feels sad, but not the way it would have been had she still held the same estimation in his eyes. This is someone he was once close to, someone he considered his own. So he will feel some sadness. But her actions since she was found and the selfishness she displayed made him decide to cut her from his life. However, before that could really happen, she got killed.
What a pity. Juhi could have had a friend for life in Neil and also Avni. But she ruined it all by listening to Vidyut and RP and also trying to fake her way into Neil's life again. She lost everything in the end. Poor Neil. What a terrible situation to end up in? His ex lied to him and used him, then she gets killed and his wife gets accused of her murder. Juhi stiched up Avni good by recording that video. I bet V told her to do this so they can frame Avni. Maybe he even told her they can fake her death, but in actual fact he really killed her!