Despair. That's what he felt and he didn't know how to get it off his chest. Because if he did something, something he couldn't know was right, he would regret it.

It was a problem, because now you were telling him something he wasn't paying attention to, he was just staring at you and thinking.

"I love you" he said, interrupting you. He felt determined. But at that moment he regretted it, not the feeling, he regretted the way he said it, he thought it was the worst thing he could say.