There are multiples ways to say the same thing but I am searching the one that fits me most.

The main point to communicate is the we can see through all the bullshit and that if she bring drama she will break her own plate.

I tend to say “act right” or “be normal” but that’s on the moment she slips. What about something to prevent all these?I am looking for a phrase as an announcement that is being said on the 1st date let’s say, and gets the message through.