Nickolas meeting Brina.

And when Nick remembered that special relation these both shared, he was adamant not to let them get together.

It was because the chances of Edward and Sabrina getting married were very high. 

Although Sabrina's parents promised Nick that they would marry their daughter to him, it was with one condition that their daughter had to willingly agree to it.

And, their promise would no longer be applicable if she fell in love with others and decided to marry that person. 

So, when Nickolas remembered those clause's, he right away knew it would get difficult for him if Sabrina and Edward start looking at each other. 

With their special relationship and equal statuses combined with the deep friendship between their families, their relationship could progress at a fast pace. 

So, at that instant, Nickolas got extremely worried and a quick though lit up his mind in that tension.