-YOU NEED TO PACK YOUR THINGS AND GO-
Watching Nina run away and go and sob after he had told her the truth made Derrick know for sure that Nina was still in love with him. There is no explanation for her behaviour other than that. She is still in love with him and that is why it really hurt her to know that he had already moved on with someone else.
Her actions didn't make Derrick feel that way. As a matter of fact, it made him aware that he was on the right track.
What he had done, separating the two of them, was working for his own good.
He was going to finally carry out the perfect revenge on him when he ends things with her. He will tell her that he didn't really care about her, he was using her. He couldn't wait for that day when he would make her feel the same pain that he felt
