Is your best friend mono? That sounds like the crap my mono friends say. I usually let them go into it and say what they want to say and sometimes even make jokes about it but I am confident nothing they say would actually happen. Either put a stop to that kind of behavior or remember that it's coming from someone that doesn't understand poly.
It's hard to stop worrying. I get that. Don't let others build your fears.
"Regret for the things we did can be tempered by time; it is the regret for the things we did not do that is inconsolable." - Sydney Smith
Kyle: 27 year old male
Katie (rymmare): 25 year old female
Kids: girl: 5 years old, boy: 3 years old