I have a boyfriend that has a best friend that I have a crush on am I wrong?

no! never! don't!

First, please dump this yeller boyfriend. If he is this angry while you are just dating - it will be 10 times worse if you marry him!

Second, the friend of his after realizing that you are truly separated from this guy - and NEVER going back could possibly make a move then. He won't if he thinks there is any chance of you and this guy getting back together. It would totally be breaking guy code. Which by the way - since this is his bestfriend - he may not make a move anyway - unless he is willing to lose this guy as his friend permanently.

Best of luck!

Having a crush while in a relationship is normal. As long as it doesn't get to you too much, to the point where you start thinking about cheating on your bf.
Since your boyfriend is controlling and jealous, don't tell him about your crush. That might ruin his friendship with his bestfriend. You don't want to ruin a good friendship.
If his bestfriend wants to go out with your sister, then let him if your sister wouldn't mind. I mean, it's their life right?

First of all, I think you have to figure out where you are at in this relationship. I mean, it sounds like you feel trapped, or stuck. Are you really happy? Do you feel like you've lost control of your own life?
I guess what I'm trying to say is, figure out what you really want. If this relationship you are in is what you really want, then don't let this "crush" feeling get too far. Meaning, if you start thinking about him too much, or you get jealous when he goes out with another girl, then you have to get rid of it or it will ruin your relationship. If you really love your bf, then will eventually get over the "crush" feeling.
But if you are not sure, that you really want to continue in this relationship, then break up with your bf, and see what his bestfriend will do about it :)

you cannot do that your boyfriend I mean he can be controlling and what not, but doing something like that with his bestfriend not a good idea. talk to your boyfriend and tell him what you feel, and that if he doesn't change your going to have to take some drastic measures. I don't think he's bestfriend has a crush on you he just thinks that your a beautiful girl and that's why he is willing to date your identical sister.