So let's say you are exclusive with this girl, you both think this is the most fitting situation right now. Not like a declared official LTR, just an exclusive relationship "with benefits" of some sort.

Tldr: what will be a right way to explain that while we exclusive I don't want her to have some other bullshit with some other guy?

At one point she comes up with the "what are our limits" question, and starts asking about is it ok for her to flirt with other guys, or go on a date with another guy and all this bullshit.

On the one hand the most rp thing to say will be "idgaf, just don't hide it from me. We'll be good anyways but know that we might part away after this."

Another approach is just saying confidently the truth, that I don't want her to have a thing with other guys, that's the whole point of being exclusive.

What do you thing is the best way to act in this matter?