Whooo Natalia! They really needed this. And Natalia kissed Olivia, which think she really needed to be the one to make that move.

But...I actually hope they don't go further than that, at this moment. Start the divorce, annulment, whatever it's going to be first, for Olivia's sake if nothing else - so that she doesn't feel that she is a homewrecker yet again.
She is not, but don't think it would take much for her to feel like she is.