Through all his time being a group leader, he never thought he'd miss someone this much. His heart and soul ache for you, are you gonna come back?

He's spent days sending Mephisto out to find you only resulting in the remnants if you being there. He'd remembered the day when you told him you'd be on a business trip that would last a little while but it turned out longer than you expected, with no contact and just focusing on the mission.

This is basically after you stop playing the game for a while and their reactions to you coming back. Play it how you want! He's ultimately really sad and misses you.