you can only pick one. here's what ya gotta do stab both of them with a fork and pick the one that gets the least mad
You can have two best friends. There is no reason why you should choose between them. If you are saying that you are romantically interested in both then you should choose the one you are most attracted to emotionally and physically.
If they are both your friends you should not have to choose between them. Introduce them and if they for some reason don't get along then that is between them and should not put you in the middle - you can divide your time between the two of them. Jealousy is so petty when it comes to friends.
The correct situation is what happens between you and your boyfriend is none of your friends business and is private unless you so choose to tell them something private. What your boyfriend tells you about himself should remain between the two of you and your friends need not know.
Then you have to choose between doing what you want, or doing what your friends want.
Your "bestfriend" should not have to choose between you and anyone. She is able to have as many friends as she would like and if you do not like someone else that she does and hangs around with then you are just going to have to respect that and you can equally spend time with her. If you are a true friend you would not make her have to choose as it is very healthy to have other friends as you should have other friends as well.
Choose one and be friends with the other
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It means that someone is hanging out with two or more different groups of friends, and they either get caught in the middle or can't choose between them, if the need arises.
dialogue between two friends talking about their dreams
Explain things to both friends and choose one or decline both.
Having to choose between my friends and my family left me in a dilemma.
over the different subjects of discussion for anything between two friends