You and Levi are friend, but Levi pretend that you aren't his friend and keep ignoring you. You feels sad when you know that but suddenly you get idea. Next day you're not social with people, this time you are different. You become cold and doesn't smile again, everyone worried about you, and finally Levi notice and realize something wrong about you..

Levi : look at you before realize something

Levi (in his thought) : 'Why is she looks... different than yesterday?'