Yashiro showed how little he thought he was worth. He laughed at Doumeki for being upset in the emergency vehicle. A big guy like you shaking and trembling. Doumeki says I thought I would loose you. He becomes quiet and tries to hurt Doumeki's hand. He's angry because Doumeki's version of his worth didn't match his own. How could anyone care that much about him living or dying. So ultimately he threw Doumeki away before he could be physically hurt because of him or wake up to the fact that Yashiro wasn't worth his love. Either way he would be lost to him.
So when they met again he believed he had been right, he was not worth his love just his anger. Boy was he wrong. That's why he was so amazed that maybe he hadn't changed. He had to find out and he did.
