[Logically, she knows to only take this with a grain of salt, even though her first instinct is to flinch away or shut down or deny it (she does none of these things, at least). You are, after all, a scorned lover. :'|
But still... the worst thing is that he didn't really tell her a reason. Only that it was a mistake and they moved too quickly. The latter of which just doesn't sound like him at all. But she isn't about to ask for clarification from Lucifer or anyone else.]