first of all,meh is not ur bro...eheh,she ain't bro for any and 2ndly...i mean to say,if u are truely in love with the person,neva hide anything bcuz To the world she may be one person,but to u that person is the world .truth are often bitter but none can run awya from it .so,according to me ,it better for u as soon as u reveal her ur truth(though theres a high risk of lossing her) .Rember its something u did in past ,its ur past man,so c'on ,grow up and face it like a "MAN".u are the one who committed mistakes and u sud be the one to face situation being bold enuff...after all love is smiling on the inside and out...and only sharing things and knowing each-other in real can bring it in life...choice is urs wether u wanna be a lier and live life miserably ever or confess the truth and take a risk of ,either being loved & trusted by her OR loss her forever.