You can’t choose how others react, only how you respond (and he responded pretty poorly ngl). You didn’t cause him to flip out, whatever preconceived notion he has is his business. CNC is a harmless kink in the grand scheme of things. TLDR, your kink is normal, your kink didn’t force him to go talk to someone else, and you might want to have a chat with him about why he did that
if he reacted to u poorly and went to her first abt it… it says he finds comfort in her more than him. her outward “despise” is her overcompensating to make it seem unlikely. it’s wrong and it’s sad but it kinda sounds like that’s what they have goin on. ik it’s not related to the initial post but since no one explained it to u i thought id help from an outside perspective <3
It sounds like the best friend and the boyfriend might be sleeping together (and I’m so very sorry OP if they are) because overcompensating by “despising” and then him going to her with that kind of thing? Being buddy buddy? I’d have a serious talk and then probably leave. But that’s just me.