My boyfriend cuddles his female "best friend" intimately, am I wrong for expressing my discomfort in a manner like the adult I am?

Anonymous
My boyfriend is going to another state to see his best friend in the next couple of months, he told me that they cuddle. Like, on the couch.
I don't mind when he hugs other girls, no way.. But this is a little far. I expressed my discomfort in a mature manner and told him as long as it will not occur on/in a BED.. Yes, I was dumb. My mother told me to go back and just TELL him, because me keeping guys on too long of a leash has gotten me cheated on lots. I again approached like an adult and said this has to be the last time it happens, as we will be moving in together eventually due to tough living right now I don't want to be holding up the house while another girl is in my "spot." He was quite annoyed and said he has never let a relationship change friendships, and his bestfriend comes before a relationship (he took that one back.) So I spat that it's just f*cking disrespectful towards me and that if she cannot see where I am coming from, she must not be very intelligent as a female nor a good friend, this caused him to become quite infuriated and said "If you're just going to talk shit about her, stop right now."
I don't know this girl and they have no history according to him, and he said he has only known her for a year.. She seems nice, but even if she was my own best friend, I would still have the identical level of discomfort here.

I guess what I'm asking is, is it fair to come on in when, quote: my boyfriend "She was here before you.." and start setting "rules"? I always try my hardest to express how I feel in the most understandable way possible and calmly, but him snapping at me while being in a bad mood just made me snap back and say "It stops NOW."
I'm not sure if I should feel like I'm a bit of a bossy b*tch for ordering him around when we simply have different beliefs, or that I did the right thing for us both..
(Excuse all my brief English , 2000 isn't enough for my regular speaking xD )
My boyfriend cuddles his female "best friend" intimately, am I wrong for expressing my discomfort in a manner like the adult I am?
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