It was more like love at first sight for Travis. But admiring her from a distance was enough to make his day. She was happy around the Duke. They were intimate and as he watched them from his window, he never felt envious like this before. He wanted to snatch the Duke's wife badly. He wanted her so much.
He pulled out his phone and messaged Katarina. He decided that he needed to take revenge for the love of his life. He was about to approach her that night in the bar but then he chose a shabby man that turned out to be the Crown Prince. He thought that he would take advantage of her but he didn't. He cares for her and worked hard for her. He saw it all because he investigated him. He couldn't find anything about him that's why he focused on Victoria's happiness.
It pains when he sees the woman he loves happy in someone else's arms but then, he thought that she would never be happy with him. Because he can't give that happiness that the Duke can give.