Do you see a difference between that, and stating a intention to leave the relationship if the other person has sex with someone else? Luckily I currently live in a time and place where these two scenarios are often functionally similar.
Yes, as long as it is not intended as a threat. If not meant as a threat, then it is just a statement of your own preferences (e.g. “I strongly prefer not to be in a relationship that is non-monogamous”). I find such preferences highly suboptimal, but I’m willing to accept that some people are unable to alter them.
Do you see a difference between that, and stating a intention to leave the relationship if the other person has sex with someone else? Luckily I currently live in a time and place where these two scenarios are often functionally similar.
Yes, as long as it is not intended as a threat. If not meant as a threat, then it is just a statement of your own preferences (e.g. “I strongly prefer not to be in a relationship that is non-monogamous”). I find such preferences highly suboptimal, but I’m willing to accept that some people are unable to alter them.