Stefan | Rebekah
She's probably being dramatic about it. Though apparently she attacked Elena, so that just amuses me.
I think between him sulking over the fact that Katherine and Elijah seem to be together now, and him being so completely obsessed with Caroline he's mostly forgotten he has a sister, thoughts of you, me and what we might be up to are probably low in his mind. He'll only remember when he wants something from one of us.