Boyfriend wants to have a threesome

Taylor • African Hippie tracking her period ✌🏿️
My boyfriend wants to have a threesome. He says its always been a fantasy of his and he's wanted to do it before we got together , we've been together for awhile and we've been pretty serious but HEELLLL NO. He brought it up around my birthday when I sent him a picture of me and my bestfriend in a bikini, then he told me that us three should have a threesome.... SHOULD I NOT BE OFFENDED??! WHY WOULD YOU WANT TO BE SEXUAL WITH ANOTHER PERSON ?! I know that there are other couples that haven't had a problem with it but .... Idk.  He wants me to pick the girl and says he wants me to pick whoever I want so I can be comfortable but ummmmm . Why? He doesn't really understand why I think it's a big deal but idk I'm kinda territorial so it makes me cringe to think about.
If you've had a threesome how was it? 
If not , how would you feel if your SO asked to have a threesome with you? Would you do it ? Would you feel uncomfortable ? If so why?
And should I do it?

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