You had all the right reasons to be mad at him when you two were discussing. But..in fact it was only you doing all the scolding because you were arguing about whatever you were doing while Dean was looking at your lips and then back at your eyes all the time, like if he was dumbfounded. He had a look of stupidity. Like he wasn't thinking at all and his brain was shut down, it was funny but it didn't make you less angry