Levi wrote you letter that he left you. You were dating 1 year And for both of you it was perfect relationship. Everything broke up when he left letter for you.

I'm leaving very far away. Don't try find me. I'm breaking up with you. ~Levi

Now It's one year when you're without him and you're on mission. It's mission in Yalkell and after one day when you're with Hange and others your teammates there... You looked around and you see Levi how he have cold face like always.