Is there an idiom for fake affection?
Sometimes, people pretend to care about someone else just to go along with the flow.
I can think of two-faced, but two-faced is being the opposite and doesn't imply someone is faking it without saying bad things behind someone's back. Is there a more neutral expression for this?
Wearing a mask is kinda similar, but not exactly what I am looking for, because it doesn't imply affection.