Zach had just made the "Z Squad" a few weeks ago and Levi was really missing Zach, since Zach quit "The Squad"

Levi: sighs whilst looking at a photo of Zach "I really miss you Zach..."

Levi sighs, feeling hurt that Zach left, so he decided to text him: "Hey Zach, How're you doing? I miss you a lot.."