Exactly, they are just sticking around you and being chummy when they don't give a daym anymore.
As for what to do... they're probably gonna hate you no matter how you say it, so you got two options, either just ignore them completely and stop talking, or be wholly honest with how you feel. Neither are bad options but the latter is what I'd want to do, and if they get rude about it just don't pay mind to it.