Lucifer is the kind of person who constantly asks these questions.
-Do you love me?
-You don't hate me, right?
-Did I do something wrong?
It breaks Michael's heart severely. But he knows Lucifer always gets worried that Michael will suddenly hate him, or will suddenly turn against him. Michael always answers these questions with the same answers.
-I still love you. I always have.
-Of course not Luce. I couldn't hate you.
-You haven't done anything wrong. You're just fine.