it's Frustrating

[Charlai]

idk i rel lyk dis girl n she knw it (she hav a bf bt i cool wit he's lyk her moustache so her parents doh bug she n ting) n jed is lyk my hormones go crazy wen i'm wit she jed even wen i js tinkn abt she it so arrrgh cuz idk if she wud lyki hav np wit being wit she n d way she does tlk is nt lyk she wud want 2 b wit me n i doh wah b trackn she if i js gna b wastn my tme n i try 2 tell she all dat bt wen i c she is was lyk ...................my mind went blank idk wat 2 do...................................

[Choose]

I won't lie, I have a difficult time understanding what you just typed, but basically what I got out of this is:

You like a girl in a romantic way.
She has a boyfriend.
You haven't told her because you're not sure how she will react.

My advice would be:

A) Tell her, although this may put your friendship at jeopardy.
B) Don't tell her and keep suffering and feeling frustrated.

Telling her may alleviate some of the stress you are feeling, even if she doesn't feel the same way.