<human>: Can you condense the text into a few key points?

I met this girl 7 months ago through a mutual friend and with time, we learned how much in common and how similar we are. So naturally, we became best friends. Because we attend the same university, it is easy for us to spend time with each other and we do so, every single day. I've always been jealous of another friend she had who she expressed to have feelings for. She confessed her feelings to him and he reciprocated but he rejected because he had feelings for another girl as well. They remained friends and only recently I found out that they have decided to date after things with the other girl went poorly. 
When I found out, I had no words. I wanted to die. She didn't know why I was acting this way and what I keep telling her is that it's because I'm scared things won't be the same with her having a boyfriend. Although there is truth to that statement, that isn't completely it. The complete truth is that I have had immense feelings for my best friend for almost 5 months now and it's only getting stronger each day. She doesn't know this. No one knows this because I am "straight". I have no idea what to do and it's destroying our friendship. She's scared I'll push her away and I'm scared of the same. I'm scared because I know things will not be the same. When I think about them together, it makes me angry when I know she cares about someone who isn't me. Telling her I have feelings for her is NOT option. So I'm asking, what should I do to help cope with this without ruining our friendship?
<bot>: My best friend doesn't know I have feelings for her and I don't know how to cope with her having a boyfriend without destroying our friendship.