I have been in an ENM Relationship for 3 years, we have a rule that you have to take permission before sleeping with other people and if any of us say no it won't happen. 2 months ago we had a 3some with a girl he used have feelings for a long time ago and she became our friend after years so i didn't see a problem, but i didn't enjoy myself very much i also communicated that and it turned into a week long fight, yesterday they were hanging out and he asked if they could sleep together i said no because i felt a little jealous and i wasn't 100% sure i wouldn't be upset later after i explained why i said no he tried to tell me some reassuring words but it felt backhanded somehow, or he was saying it with a tone, I tried not make a big deal out of it but idk why i felt attacked, he ended the conversation by saying he is disappointed and he would never say no to me (even though he did multiple times) what should i do?