1/2
[Sebastian starts on yet another line of apple rings to be dried.
Humans always ask for closure on these things, when the answer is always I was only using you,I don't love you anymore,I've grown to resent everything about you... The kindest reason might be My family forbids it, but when is it ever You're too good for me or anything you can reason the other person into reconsidering? Sebastian could tell her she doesn't want to know and mean it, and that would be the kindest, most considerate direction to take this conversation in.
He could also say something that sounds like the truth - he's become so talented at saying blatantly untrue things without technically lying - and make matters so much worse for Lucifer.