Looking for advice on how to better be firm in saying no to exclusivity when a girl starts pushing for it.

This is something I’ve struggled with in past (ability to say no firmly to exclusivity) and generally just opted to say sure and just cheat. This is an aspect I’d like to improve on.

Any advice on how to navigate this better?

In some sense like yeah I know you’re supposed to just stand on business and say some schpeel amongst the lines of “I’m not looking for anything serious rn/im about to be moving anyways/etc” and be stoic in the sense of being okay with whatever the outcome is (plates break one way or another). I guess just looking for additional input.

It is pretty self explanatory reading it on the sidebar/in comments, but at least in my experience it has often been a lot easier said than done.

Thanks all in advance.